Yes of course I remember, how could I forget how you feel?
Frank is answering his rhetorical question, saying “of course he remembers how his partner feels. In other words, everything they had because he was his first time (likely first time he had sex or falling in love) and to some people that’s a very sentimental occurrence in their life.
This entire bridge can also be understood as Frank’s lover’s reply to what he has been saying. Frank has been accusing them of not realizing the love that Frank gives her and this lover is saying she/he will never forget how Frank feels. They shared a lot of memories that Frank’s lover will never forget.
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