Do you think you get to a point where you say ok, I have been disrespected, lied to, manipulated and disappointed to the point where you finally just say I dont want to fight over this OP anymore just go...be with OP because I cant do this anymore.
Yes. Absolutely. And this is a great point to get to. Once you're there you can start focusing on yourself and working to make yourself the best person possible.
Why are you worried about trusting him? Has he said he has finished the affair and wants nothing more than to build a new relationship with you? Unless and until he proves through his actions that this is what he has done and this is what he wants don't waste you're time thinking about it. Don't put the cart before the horse.
If you love somebody, set them free. http://tinyurl.com/2empx2g