I cheated once. As stated before in this thread being "fucked up" is not an excuse, but in my situation that's ultimately what allowed things to go as far as they did. My ass was carried out of a bar by someone I hardly knew (met him for the first time that night, but had talked to him online/shared mutual friends). I was placed into his car and before I knew it, he was on top of me. It all happened so quickly, but lasted all but a minute or so before I could comprehend what was going on. I told him that I didn't want this and as tears started to well up in my eyes, he got off of me.
The only memories I have are just a few short movie-like clips of that night. I remember trying to explain how to get to my house from where we were, I remember sitting at my front door and looking for my phone to call my BF at the time. Between hysterical sobs I told him everything that had taken place and that I loved him so incredibly much. I didn't sleep at all that night. I waited until I sobered up enough to drive the 40 minutes to his house to tell him face to face and pray to god he'd stay with me, even though I expected the worst.
This happened around 7 months in our relationship, but we continued to date for over another year. I slowly deteriorated over time though. I let myself go, I stopped taking care of myself..I hated myself. He grew into an angry and violent (never towards me) person who would never look at me with the same eyes again. He ended it in May finally saying that he couldn't take it anymore. I admire him for being strong enough to know that we both we're falling apart from the inside out. I think cheating is pretty hard to forget, but I believe under some circumstances, it is possible to forgive. We don't rule out the possibility of trying again someday, but we're currently take time for ourselves and to do the growing up that both of us need. I still think about him every single day though.
There is absolutely no reason to cheat. Everyone should know their limits, boundaries, and be able to recognize the love that they have for their partner.