OMG!

okay so here's the thing, the past few weeks I have been feeling very emotional and depressed. Can't sleep to much, had a headache for months.
I think I love my husband, and he cares for me. I wish I could turn back the hands of time and go back to were he was faithful to just me. Things were alot simpler then and I knew where I stood with him. These past few weeks have been miserable. I don't know if it's just hitting me that I have HIV and it's always going to be a part of my life. I wonder why me, what did I do wrong, I was always faithful to my husband, or maybe he did it on purpose, so no other man would want me. He doesn't know that I know he is going back to his old habits, he created an account on a male website, so far he hasn't done anything just reading and writing back and forth, yet with me he's been frisky and wanting some, is there anything I can do to keep him faithful to me or do I just tell him it's over? I don't understand how he can do this to me and give me HIV and still not be devoted. I'm tired of this! He gets upset if I don't wear my wedding ring, but he doesn't always wear his. AAAAAAA....MEN! ANy suggestion or advice you can give me?