<human>: Can you provide a brief rundown of the text in within 3 sentences?

Throwaway since my friends know about my main account.

I dated my ex for ~3 years. Great relationship, can talk about anything, his family loves me. We've experimented with open relationships and I had the green light to explore. Met my current bf shortly before leaving for 3 months for an internship. We moved quickly and decided to date. I told the now ex all about it and told him I needed space to explore this and told him he could see others. 

Fast forward after the 3 months period. The LDR with the current bf started to get strained because of the distance. I told him we should hold off till I get back. Once I got back things were a little strange between us and it took a few weeks to get comfortable around each other again. In the meantime I had sex with my ex twice. He wanted it and I went along with it. I didn't want to disappoint him. I still care about him and don't want him to feel bad or upset. I stopped once me and the current became official again.

That was until last night. The situation is all my fault. Some of my things are still at the ex's. I went over to take care of it. At one point I was bent over…my ex came up behind me and pulled my pants down, pulled his dick out, and without a word we had sex like that for a few minutes. The whole time all I could think about was why am I not saying no? This is wrong the current would be upset and I don't want this. I was in shock at first but I still was in control, I should have done something. Now it's the next day and all I want to do is cry. I talked to my ex and told him it could never happen again, he understands. I REALLY don't want to tell my current. It would hurt him and I would lose him forever and our friends would hate me. I don't like having secrets from who I'm dating but I think this is something I can't make myself come clean to. Please, give me advice. I'm a long time lurker and now I'm the one that needs help.
<bot>: Cheated last night on my bf with my ex. I REALLY don't want to tell him. It won't EVER happen again. Is it okay to forget it and move on?