This song is one guy's RSVP to a wedding invitation from his ex-girlfriend. He feels he should explain why he is not going to attend. The refrain uses the tricky verb dimenticare (to forget) in three different ways, first as an infinitive: dimenticare, then with a direct object pronoun attached to it: dimenticarti (to forget you), and finally, as a reflexive verb (to forget) with its pronoun attached: dimenticarmi di te (to forget you).