How do you stop being in love with someone?

I think I feel in love with a guy, he turned out to be dating another woman. He told me he loved me and would never lie to me and that he was afraid of losing me and I told him he wouldn't because I truly thought that we'd be in each other's life forever, but then I asked him about a screenshot he sent me and he gas lit me into thinking I was crazy so I told him it was over. Months later he apologized and we kind of started talking and I though we might be able to be friends but then I found out that the entire time we started talking and everything he had a girlfriend and when I confronted him about it he said "it's not like what we have" and that she was just crazy and he couldn't get rid of her. I was so hurt I couldn't even cry about it. I've felt numb ever since; I've blocked him on everything, but some days I miss him so much it hurts and I won't call or text him but I still miss him so much. It just hurts.

How do you stop being in love with someone?
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