confusing but need ti rant

I started talking to a guy who told me he was single. A few weeks later, his ex-girlfriend contacted me and said that both of us had been involved with him at the same time. After hearing her side, I decided to stop communicating with him. However, he continued reaching out, apologizing, asking for another chance, and insisting that he wanted to be with me. Eventually, I gave him that chance.

When his ex found out, things became tense. We exchanged words on social media, and the entire situation became emotionally exhausting. Not long after, I ended things with him because I wanted peace of mind. He was still messaging, meeting up with, and maintaining contact with his ex, and I no longer wanted to be part of the drama.

Even after I ended things, he would occasionally contact me. His ex would sometimes ask whether he had reached out, and I always answered honestly and told her that he had, while making it clear that I was no longer involved with him.

Recently, I learned that they got back together and are dating again. Since finding out, I've been carrying around a lot of guilt and confusion about everything that happened. I keep replaying the situation in my head and wondering about my role in it. Part of me wonders whether I was the other woman or whether I was simply caught in the middle of a situation that was already messy before I entered it.

Even though it's over and they've moved on, I still find myself struggling to let go of the feelings surrounding it. I guess I just needed to get this off my chest.