This is the stripper, yes? All the personality you see is play acting. Being hypersexualised and luring men in is how she makes money...and of course she isn't going to have a relationship with one of her johns. Sassy one minute, childish the next? It's all part of the act and she changes according to who she wants to impress.
I once asked if she ever spends time with you which you haven't paid for. I don't recall you answering.
Never regret anything that has happened in your life. It cannot be changed, forgotten or undone. So, take it as a lesson learned and move on.