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Me and my ex had a long breakup that happened over the course of a few months where we tried to work things out but eventually grew apart, one day she finally breaks and says I don't think I love you anymore and from there I was already accepting of the situation and moved on and was fine with it, a few weeks later she broke no contact and simply texted to see how I'm doing, we also saw eachother at gym and it was civil and if we were upset we would console eachother. Now I started talking to another girl in this period because I was over my ex but we still spoke, I had confessed to the girl I'm speaking too but she had said not now because she was still getting over her ex but she didn't explicitly say there's no chance, we continued to speak after that. My ex asked for some things of hers back so I invited her to come and offered to buy her some food and we could catch up, we ended up having sex because we were both reminiscing on what we had and didn't miss eachother but agreed to have a nice moment together. A few weeks later, my ex and the girl I was talking to communicated and both found out about eachother and blocked me at the same time, is what I did wrong I was obviously rejected by the girl and was single and just had sex with my ex because we happened to be in a situation.