Would I be mad to give him another chance?
I can't answer that for you.
This is one of those times where you have to allow yourself to know what you know, and you have to follow your own moral compass. You joined us two years ago, so I'm guessing you've read of a lot of posts and have found similarities amongst them. Maybe the stories you've read are similar to your story. The question you have to answer is what you are going to do with the knowledge you've gained.
Believe it or not, that's a hard thing to do sometimes. Our hearts often get in the way of making decisions that are best for us. But if you're to be truly honest with yourself, you need to recognize that your margin for error is very, very small. If you're going to assume risk, then you have to know what the worst case scenario is if that decision doesn't work out.
Take care, and do what's best for you.