So a few days ago I met with this girl I matched with on Tinder. She was very enthusiastic the whole week, kept messaging me "can't wait" etc etc...

So she came over to my place and we had sex and it was amazing. She then stayed the night. The next day thought she felt really distant and cold and was mostly on her phone. She stayed at my place the whole morning because she was gonna visit a friend in my city afterwards and had to wait for them to wake up. We ordered some food, and she insisted that I pay her in cash, not mobilepay. This seems to me that she just didn't want me to get her number.

We kissed a lot in the morning too, I tried to escalate but it seemed like she didnt want. When she left she leaned in for a long kiss at the door. But I still feel like she is not interested at all regardless...

Why do you guys think this happened? I have absolutely 0 clue. This exact same thing happened a month ago, but the sex wasn't as great with this girl and I know that this other girl thinks sex is really important, so it could've been that. This new girl however told me early on that she is looking for a long term relationship.

I am just fucking heart broken... I really liked this girl. Why did this happen and what should I do now?

(Sorry if the flair is wrong, no clue which one I should use)