Did I cheat on him?

After breaking up with my ex for being abusive and cheating on me, he tried to prove to me that he had changed so we started seeing each other again after a year of being apart. I moved apartments recently and he offered to help me with that, so he ended up staying at my place for a couple of weeks. I was very hurt and resentful with him so I never agreed to get back together, we were figuring out our situation so we did kiss and had sex but never became a couple again. One night I went out partying with some friends and I kissed some guy, I wasn’t planning for that to happen that night, my ex called me and texted me repeatedly all night and I assured him that nothing would happen but it did. I felt guilty so my plan was to tell him the truth and ask him to leave my apartment but he reacted in a violent way and made me feel really bad about it, accusing me of cheating on him. I’ve never done anything like that before so I let him make me feel guilty and he stayed. Did I cheat on him? Right now I’m very confused about what I did and what kind of person I am.
Did I cheat on him?
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