I am tired of it

My ex is mad I had sex after we broke up. And is saying I cheated three times. And wants to look into my eyes when I talk about it. I want to be with my ex. I just am tired of being told I cheated so many times when I was broken up with. I said one of them reached out to me, I didn’t reply. I wasn’t the same person drunk and I’m in recovery and have been months. But somehow my eyes are going to reveal if that’s truthful.