To trust or not to trust...

Any advice would be greatly appreciated...ill try to make this quick and painless

Three years ago i was in a relationship that ended up changing my life. i met him...he said he loved me...and so the story goes. i went away for a weekend, and he cheated. he told me the day after it happened, and to this day says he doesn't remember it bc he had blacked out after getting hit in the head in a fight and drinking and whatever. i said i did not wish to take him back as there was other stuff that i wont get into that happened as well. So he got into this depression and to make a long story short he tried to end his life while i was getting the rest of my stuff from his place one night. I spent the night in the hospital, called his parents, all that stuff... after that nightmare, which took me a while to bounce back from, we tried to see if we could work anything out, which did not happen.

I did not have any contact with him for about a year and a half and I did my share of dating. Yet no feelings like those i had for him before everything happened. Now, two years later we have started talking again and he has straightened himself out, and now says he is willing to do anything to be with me forever. He apologizes about what he put me through every day and says that he was very different two years ago. He said he is willing to do anything to prove it.

I know that it was a horrible situation and I try to take the positive from it, but of course I do not want it to happen again. "Once shame on you, twice shame on me"

So you tell me.... Can people make that much of a change in two years? Do you think there is a potential for me to trust him again? I've never felt so in love as I did with him, so do you think we should try working on it?? I just need some objective looks on this because i get so many different answers from people who are connected to me in some way. I really appreciate anything you can give me. Thanks so much