meos amores: not of a person (cf. Catul. 6.16n.), but of the affection itself: ‘is it thus you treat my love for you?’ cf. Catul. 64.27n. With the ellipsis of the verb in a question of surprise cf. Cic. Att. 13.24 “nihil igitur ne ei quidem litterarum?”
 maestius: and let it be sadder,—for Catullus is so disconsolate that he has ceased to desire encouragement, and yearns only for what is in accordance with his own mood.
 lacrimis Simonideis: Simonides (556-467 B.C.), the celebrated poet of Ceos, excelled especially in plaintive themes, and so won even from Aeschylus the prize offered for an elegy upon the Athenians who fell at Marathon.