Just Got Over My Ex but Couldn't Help Myself

I just ended things with my ex two weeks ago. We broke up over some stupid drama, and it's not like I haven't been single before. But last night, after having a few drinks at the bar, I couldn't resist texting her. She said yes when I asked to come over. It was wild, intense, she was so into me, just as much as ever. Felt good but also wrong, knowing it's never going back. We both knew that, still did it anyway. Can't help thinking about what could have been.