How to feel better

I've just called it quits with a guy I've been talking to throughout lockdown, I was really into him. But there were a few things that made me question whether we're suited and I didn't like worrying or overthinking over stuff anymore. I just feel really crappy atm cause I liked him a lot, he was so good looking and we had so much in common. How can I stop feeling down and stop myself from texting him? He says he doesn't want me to block him but it feels hard not to😪