Etymology
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love-bird (n.)

also lovebird, 1590s, small species of West African parrot, noted for the remarkable attention mating pairs pay to one another; figurative sense of "a lover" is attested from 1911.

Hold hands, you lovebirds. [Emil Sitka]
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bird (n.2)
"maiden, young girl; woman of noble birth, damsel, lady, lady in waiting," also "the Virgin Mary," c. 1200, perhaps a variant of birth (n.) "birth, lineage," confused with burd and bride (q.q.v.), but felt by later writers as a figurative use of bird (n.1), which originally meant "young bird" and sometimes in Middle English was extended to the young of other animals and humans. In later Middle English bird (n.2) largely was confined to alliterative poetry and to alliterative phrases. Modern slang meaning "young woman" is from 1915, and probably arose independently of the older word (compare slang use of chick).
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bird (n.3)
"middle finger held up in a rude gesture," slang derived from 1860s expression give the big bird "to hiss someone like a goose," kept alive in vaudeville slang with sense of "to greet someone with boos, hisses, and catcalls" (1922), transferred 1960s to the "up yours" hand gesture (the rigid finger representing the hypothetical object to be inserted) on notion of defiance and contempt. The gesture itself seems to be much older (the human anatomy section of a 12c. Latin bestiary in Cambridge describes the middle finger as that "by means of which the pursuit of dishonour is indicated").
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love (n.)
Origin and meaning of love

Old English lufu "feeling of love; romantic sexual attraction; affection; friendliness; the love of God; Love as an abstraction or personification," from Proto-Germanic *lubo (source also of Old High German liubi "joy," German Liebe "love;" Old Norse, Old Frisian, Dutch lof; German Lob "praise;" Old Saxon liof, Old Frisian liaf, Dutch lief, Old High German liob, German lieb, Gothic liufs "dear, beloved"). The Germanic words are from PIE root *leubh- "to care, desire, love."

The weakened sense "liking, fondness" was in Old English. Meaning "a beloved person" is from early 13c. The sense "no score" (in tennis, etc.) is 1742, from the notion of playing for love (1670s), that is, for no stakes. Phrase for love or money "for anything" is attested from 1580s. The phrase no love lost (between two people) is ambiguous and was used 17c. in reference to two who love each other well (c. 1640) as well as two who have no liking for each other (1620s, the usual modern sense).

To fall in love is attested from early 15c.; to be in love with (someone) is from c. 1500. To make love is from 1570s in the sense "pay amorous attention to;" as a euphemism for "have sex," it is attested from c. 1950. Love affair "a particular experience of love" is from 1590s. Love life "one's collective amorous activities" is from 1919, originally a term in psychological jargon. Love beads is from 1968. Love bug, imaginary insect, is from 1883. Love-handles "the fat on one's sides" is by 1967.

"Even now," she thought, "almost no one remembers Esteban and Pepita but myself. Camilla alone remembers her Uncle Pio and her son; this woman, her mother. But soon we shall die and all memory of those five will have left the earth, and we ourselves shall be loved for a while and forgotten. But the love will have been enough; all those impulses of love return the love that made them. Even memory is not necessary for love. There is a land of the living and a land of the dead and the bridge is love, the only survival, the only meaning." [Thornton Wilder, "Bridge of San Luis Rey," 1927]
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bird (n.1)

"feathered, warm-blooded vertebrate animal of the class Aves," Old English bird, rare collateral form of bridd, originally "young bird, nestling" (the usual Old English for "bird" being fugol, for which see fowl (n.)), which is of uncertain origin with no cognates in any other Germanic language. The suggestion that it is related by umlaut to brood and breed is rejected by OED as "quite inadmissible." Metathesis of -r- and -i- was complete 15c. (compare wright).

Despite its early attestation, bridd is not necessarily the oldest form of bird. It is usually assumed that -ir- from -ri- arose by metathesis, but here, too, the Middle English form may go back to an ancient period. [Liberman]

Still up to c. 1400 it was often used in the specific sense "the young of a bird, fledgling, nestling, chick," and of the young of other animals (bees, fish, snakes) and human children. Compare the usual Balto-Slavic words for "bird" (Lithuanian paukštis, Old Church Slavonic pŭtica, Polish ptak, Russian ptica, etc.), said to be ultimately from the same root as Latin pullus "young of an animal."

The proper designation of the feathered creation is in E. fowl, which in course of time was specially applied to the gallinaceous tribe as the most important kind of bird for domestic use, and it was perhaps this appropriation of the word which led to the adoption of the name of the young animal as the general designation of the race. [Hensleigh Wedgwood, "A Dictionary of English Etymology," 1859]

Figurative sense of "secret source of information" is from 1540s. Meaning "man, fellow, person" is from 1799. Bird-watching attested from 1897. Bird's-eye view "the view as seen from above, as if by a bird in flight," is from 1762. For the birds recorded from 1944, supposedly in allusion to birds eating from droppings of horses and cattle. The bird-spider (1800) of the American tropics is a large sort of tarantula that can capture and kill small birds.

A byrde yn honde ys better than three yn the wode. [c. 1530]

The form with bush is attested by 1630s.

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love (v.)
Origin and meaning of love

Old English lufian "to feel love for, cherish, show love to; delight in, approve," from Proto-Germanic *lubojanan (source also of Old High German lubon, German lieben), a verb from the root of love (n.). Weakened sense of "like" attested by c. 1200. Intransitive sense "be in love, have a passionate attachment" is from mid-13c. To love (someone) up "make out with" is from 1921. To love and leave is from 1885.

This truth came borne with bier and pall,
I felt it, when I sorrow'd most,
'Tis better to have loved and lost,
Than never to have loved at all —
[Tennyson, "In Memoriam"]
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bird-lime (n.)
viscous sticky stuff prepared from holly bark and used to catch small birds, mid-15c., from bird (n.1) + lime (n.1). Used as rhyming slang for time (especially time in prison) by 1857; hence bird (n.) "jail" (by 1924).
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bird-cage (n.)
also birdcage, "portable enclosure for birds," late 15c., from bird (n.1) + cage (n.).
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love-lorn (adj.)
also lovelorn, "pining for love," 1630s, from love (n.) + lorn. It seems to be first in Milton.
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love-knot (n.)
bow or ribbon tied in a particular way, as a love token, late 14c., from love (n.) + knot (n.).
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