How do I get over this?

I don't want to go into too much detail, but I was recently hurt by someone I was close to. They left me feeling humiliated and worthless. It wasn't cheating, but I've never felt so low in my life after it. It has seriously knocked my already fragile confidence and I don't know how I'm going to manage trying to socialise when I go to uni this autumn and I see myself self-isolating and ending up extremely lonely. Any help?

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