How to rise above the feelings of betrayal and rejection?

I confided in my cousin about a man who I was deeply affectionate about and he ended up devaluing me and being disrespectful to me instead of just being honest and saying he didn’t want to date me anymore because he was the one who liked me first. It hurt me a lot because I thought he would have been considerate of my feelings.. he knew I struggled with mental health and didn’t really want to date. But I was under this notion that he could possibly be still want me despite

Depressed about it for a year I decided to talk to my cousin about it… she ended up talking to him behind my back and they started to conspire against me and talk about my mental health. It really set me off because my cousin was gaslighting me. it really hurt to the point I had to take off work and get help because of how it all went down

I don’t know how to really overcome it

How to rise above the feelings of betrayal and rejection?
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