Hi reddit! Please help. My partner (28M) and I (29F) have recently broken up after 3 and a half years together. It has been about 2 months since we broke up, i inititated it. We are still temporarily living together and sleeping in the same bed (we only have 1). I'm moving into a new place in a few weeks so like I said, temporary sitch. We ended on good terms and are good friends, just probably not the best as a couple. We have slept together once or twice since the breakup but he has later said that it is all a mistake and is happy moving forward with the breakup.
Last night, i received a message from a guy I knew years and years ago. He was my friends older brother, I had always thought he was cute and he had always made it clear that he's been interested in me. He was visiting my city and asked me for a drink. I was genuinely so conflicted but I decided to accept. I told him about the situation with my ex, us still living together and I said clearly that i couldnt promise anything happening between us. He was super understanding and said that he was happy to hang out and catch up as friends.
We met and the conversation is amazing. We are very similar, have great chemisty and he is just a true gent. The conversation flows so naturally and I was feeling really happy in his company. After a few drinks, we share a kiss. I was really vibing with him and he asked me back to his. I accepted. The sex was great, he was super caring, vocal and called me beautiful so many times. Sex was never a priority in my last relationship so I hadn't realised how much I missed it.
I wake up in the morning, head home and now I just feel so fucked. I feel so immoral and i don't know whether to tell my ex about what happened. It feels like cheating even though I know it's not. My ex and I have a great friendship and we are still in the same bed for a month for crying out loud. If I didn't still live with him, I don't think I would feel bad about sleeping with someone 2 months after a breakup. The fact we are and still have to live together is what's throwing me. I do have a lot of respect for my ex, i love him as a friend and don't want to hurt him. We have been in the friendzone for abour 2ish months as well, he seems happy to leave our relationship behind.
Am I in the wrong here? Please give me some perspective! Thank you!
TL;DR relationships.