Damn, well you did tell him that you were unhappy but the cheating, lying and the way he found out, yea that pretty much killed your relationship. Give him space so he can heal from this, if he ask for details give him and don't trickle truth him, if he ask to see your txts make you won't delete anything (hiding anything would mean you still cannot be trusted) if he chose to go NC so be it as long as he get over the pain. DO NOT try to pin any blame of him (he didn't cheat you did, and you are not the victim he is) also you should work on yourself so you won't do that again. And remember, cheating is not a mistake, it's a decision.