How do I stop being sad over ending it?

I went on three dates with this guy. They were all amazing and I had so much fun with him and he was always super affectionate and complimenting me a lot. After the third date I got a little sick and wasn’t able to see him much and I could feel him pulling away.

I told him I was feeling better and would like to see him soon and he just didn’t seem like he wanted to anymore. So I asked him if he was still interested in me and he said he doesn’t know what he wants right now. I’ve been told that if a guy isn’t sure if he wants a relationship it means he’s not sure if he wants a relationship with you. So I ended it with him.

im feeling really sad cause everything seemed so amazing then took a whole 180. I just feel really sad and wanted to know if anyone has been in the situation and what they did.

also wanna know if anyone ended things with someone who didn’t wanna relationship if they came back? I’m a little hopeful he might :(

How do I stop being sad over ending it?
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