I can understand why you would still not quite trust your husband. However, it would definitely be better for your mental health if you could manage to get the past out of your mind as much as possible and try to take him at his word.

I'm not sure we always can forget after we forgive, but each time the memory comes up, then you can forgive again. That's what I do involving my relationship with my abusive mother.

If you think it would help to talk about it, then do so. But sometimes keeping up the talking just makes it stay in your mind more, unless, as I say, you forgive after dwelling on it once again.