How do you heal from cheating?

I found out my ex has a relationship while he was trying to fix things with me. I feel so angry about it because he lied to my face. And still lied even when I confronted him and when I found out. They even live together which makes me feel worse. I just keep picturing them settling down together and having a life together and it upsets me. I feel like he wins, that he gets to continue being happy and still have her. I’ve tried telling her but she barely has any social media so it’s impossible to contact her. I’ve blocked him from everything, and deleted everything. I wish I never met him and I feel like such a fool. I wish I could just get over it now and block it out.

I use to live with him before we split and we discussed getting married so seeing he’s living with someone else is a slap in the face yet he still denies it. I have a half marathon next year so I have a lot of training ahead of me and I want to get toned. There’s some things to look forward to next year but I’m angry at the whole thing. What can I do?

How do you heal from cheating?
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