I had a similar situation a yr ago. I took my boyfriend back (after cheating) & I found him to be very remorseful & sorry, but it was ME that couldnt get past it. The trust was gone....like gone gone out the window, I questioned everything! I was losing my mind. Oh and when we got in fights, guess what's the very first issue that popped up?? Yup. Cheating.
I'm not saying your situation will be like mine. But keep in mind if you go back. It RARELY is the same as it was before...
Oh and end of story...he DID end up cheating again!

I hope you feel better soon and make a decision that's good 4 YoU!