Why does it hurt so much? And why can't I stop thinking about?

Straight up ask just something like, "are you having second thoughts? You seem a little distant."
I think all people who try online dating have been there.
Chatted to one woman for about 6 weeks before she straight up changed her mind and said she wasn't ready to start dating again. Had somebody come over for a weekend which was great and I thought we'd really hit it off and then she mistakenly dropped that she was seeing somebody else- nope, I'm not playing that game.
So many different scenarios but I think it's time to look elsewhere in your case, if she cares she'll come back.

It might be something unrelated to you, some sort of emergency or issue.

I had this happen where I’d gone into hospital and someone thought I was ignoring them.

Don’t lose hope but at the same time move forward and prioritise yourself.

It's a tricky situation. I have this problem with a friend of mine. She won't reply to me, then when I go silent, which isn't easy for a week or two, she will text me if I'm okay. I haven't seen you post anything in 2 weeks. Are you all right? Some people are like that.

It could have nothing to do with you. Try to be patient, space out your texts to her, and just make them positive. Wish her a good day, maybe that you miss her or are thinking of her. I don't know if that's too forward.

That’s a risk you take in dating and I can tell you it happens quite often. I had a great date with one guy - coffee for three hours , and I thought we really hit if off. He said he wanted to see me again and then…. Crickets. I’d text him and either no answer, or Hes very busy or not engaged, or one word answers. That was prob a decade ago, and to this day I still wonder wtf happened. Like, what did I do? What changed?

Send a message saying, i really like you but it seems like you may have some things going on, so i am here when you are ready to talk to me. The ball is in your court, I really enjoyed our time together and leave it at that.

I agree with the others. Be direct and ask her if she would rather not talk anymore and move on.

Everyone has gone through meetings like this the best thing to do is just move on.... She has second thoughts game over don't beat yourself up over it.... It isn't worth your time....

Think about why you feel hurt by someone you’ve never actually had a relationship with.

Stop texting her.

That one word responses is so annoying

Another fickle nutcase. They are a dime a dozen, especially the pretty and seemingly nice ones. Consider yourself lucky. You dodged a bullet.

Move on. If you keep trying to pursue you will look desperate; there are plenty of fish in the sea.