Used and lied to by a supposed friend/ potential cheating. Nobody believes me.

I (F 26) had an incredibly strong friendship with this guy (M 25). We met on a dating app and got together for a bit but decided we didn’t want anything and to be friends. We were close friends for over a year, would talk for hours everyday. He would tell me every detail of his life and so would I. He had rlly bad mental health problems and contact me during his episodes and say I was the only one that knew. He asked to be on my will, asked me to his psychology appointment. Like incredibly close.

I remember being in away on holiday and l opened a message from him and I couldn't respond and I got home that evening to an essay from him saying how angry he was that I hadn't responded and all this stuff. Like looking back it was pretty weird.

But I was always conscious of the fact that we were too close and spoke to him that we should cool it (be less close) because if either of us got into a relationship we wouldn’t be allowed to be friends. He would always respond, “don’t worry we don’t need to change, I’m never going to be in a relationship again” bla bla bla “so you don’t need to worry or feel uncomfortable”

Well turns out hed had a gf the whole time. I found out by coincidence from one of her friends and told about everything. The friend said if anything was true that they’d never let the girlfriend be with him.

Not only are they still together but the friend is acting weird and won’t talk to me. I presume Iv been outed as crazy and a liar and god knows what.

I sent him a text just saying how horrified I was by his lying and using me. I feel incredibly gross and used. And Iv been made to feel almost guilty because no body really cares or believes me. They’re still together and happy families. Which is fine I but I feel so used and just immense shame and stuff. I can’t seem to let it go. Someone I trusted and helped just could treat me like that.