Breaking up after 2 years

Hi all, I am new to Support Groups in all shapes and forms :-) I couldn't sleep tonight because I am going through a breakup after 2 years. The man I love is in prison - solitary confinement. Our only method of communication is via letters. I've visited him twice but it is behind a glass window (no contact). I love him very much and he tells me that I'm the only woman for him; I just couldn't understand though why he never popped the question especially when all his words were grand about he loves me and needs me. He also says that if he didn't love me he would've said so. I've had a suspicion that maybe he's writing to someone else. He swears there is no other love but me. Last year we had a misunderstanding after I shared the events of my day; he is very jealous if another man talks to me. Since then, I've noticed that he signs off on his letter with his middle name - not the first name. To me this is an indication that there is something wrong (I've heard from one other fella I know who has been to prison, that the middle name used indicates their "bad" side). I already miss him; I haven't told him I'm breaking up with him. I'm just tired of waiting. His actions do not match his grandiose words of love. I wish to heal already!