mea Lesbia: the use even here of the earlier affectionate address is in accord with the declaration that love for her still dominates him; cf. Catul. 87.2.
[2] se perdidit: i. e. by devotion to her (suo officio) through good and ill his reason has so far suffered that he is no longer in a normal mental condition, and cannot be consistent, and cease to love when he has ceased to respect.
[3-4] Cf. Catul. 72.7f.
[3-4] si optuma fias: all confidence in her has been irrevocably lost, so that no change in her character could make him believe her true.
[4] omnia: for quidlubet; cf. Hor. Carm. 1.3.25 “audax omnia perpeti” .