The answer is nothing.
Do you regret things?
Yes, I do. None of them have anything to do with you or were caused by you.
Our case wouldn’t have happened if there had been a real chance. It only happened because we both could be sure that it would never turn into something real. It was a safe place for a while. It was exciting and fun until we were on the edge of losing control. I don’t hate you but I also don’t feel that I owe you anything. We both tried in our own ways and we both had our limitations. We don’t even know each other. I guess no one does.