Jamieson, Fausset and Brown on Song of Solomon 2:16

16. mine ... his--rather, "is for me ... for Him" (Ho 3:3), where, as here, there is the assurance of indissoluble union, in spite of temporary absence. So 2:17, entreating Him to return, shows that He has gone, perhaps through her want of guarding against the "little sins" (So 2:15). The order of the clauses is reversed in So 6:3, when she is riper in faith: there she rests more on her being His; here, on His being hers; and no doubt her sense of love to Him is a pledge that she is His (Joh 14:21, 23; 1Co 8:3); this is her consolation in His withdrawal now.

I am his--by creation (Psa 100:3), by redemption (Joh 17:10; Ro 14:8; 1Co 6:19).

feedeth--as a "roe," or gazelle (So 2:17); instinct is sure to lead him back to his feeding ground, where the lilies abound. So Jesus Christ, though now withdrawn, the bride feels sure will return to His favorite resting-place (So 7:10; Psa 132:14). So hereafter (Re 21:3). Psa 45:1, title, terms his lovely bride's "lilies" [Hengstenberg] pure and white, though among thorns (So 2:2).