How do I stop blaming myself after being betrayed by a partner?

My friend told me she found my partner of 3 months on Hinge. Sent me screenshots of the profile and everything. I know 3 months isn’t long but we were good friends and very close. I feel so heartbroken. It’s not an old account because there’s updated pictures and information. He’s been extremely distant lately and asked for space after I asked him why we haven’t seen each other in a while. It’s made my anxiety go through the roof but I’m giving him space and it’s been 4 days. I know I should be upset with him but I’m pointing the anger towards myself. I feel stupid, I feel used, I feel pathetic. I feel like if I was less sensitive, more exciting, better in some way that this wouldn’t have happened. These are not thoughts I should be having. It’s not healthy.
I know I’ll get over it eventually but my heart hurts so much. I haven’t talked to him in several days and I don’t know how to bring it up. I just want this to be over and I don’t want to feel sad anymore.

How do I stop blaming myself after being betrayed by a partner?
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