I can understand why you have lost faith in this man. But, as others have said he is ill and needs help. Please remember that despite his actions to the contrary he may be a good person underneath that has made some bad choices and things are out of control for him.

You are the only one that can decide if you want to be there to support and help him. Clearly a relationship between the two of you is likely to be lost forever.

But, speaking as someone on the other side of this issue he is likely to be very depressed, sad, isolated, humiliated, embarrassed of what he has done, often times suicidal. One way or the other, whether it is you or someone else, he needs someone to be nonjudgemental and to suport him to get the help he needs.

I sent you a PM with more background information. I hope it helps you.