Marriage issue. That she never admitted.

My wife has been continuously ignoring me since our engagement that happened in 19th Apr 2015. She was in a relationship with another guy and continued till I intervened in Feb 2017. Her behavior didn't change and she still ignores me. She always put blame on me and never accepts her misdeeds. I requester her humbly , then ignoring her and now shouting and abusing her however all my efforts put flat on her. I still feel that she is in relationship and for him completely ignoring me.This has led anxiety, stress and depression. I wanted to get separated and she is not OK with that. It's hard to know what exactly she wants. I am suffering a lot because of her and need immediate relief. Sometimes, I feel to end my life to get rid of all these problems. She always calls me psycho though she was responsible for all these and for that she never admitted.