He had cheated on me a couple of years ago, while I was visiting his sister and nephew and he was working. I was hoping he would surprise us all by visiting as well but nope, he was planning and having dates with a gal he met whilst partying. We got through it. He apologized, disclosed, after I kept pressing him on his weird distant behavior.
This most recent time we were definitely broken up but still hanging out everyday, texting, him trying to repair the relationship. I asked him outright about sex and said it was important for my health that he be honest. It would not have been a deal-breaker then, but the recent deception and disregard for my body is.