Really need some honest advise
Me(29/M) and my girlfriend(26/F) have been dating since last one year. Things were really going very well between us. Before I met her, I got cheated on by my previous ex which had led to a bad breakup. I had lost hopes on finding love, had major trust issues, suicidal thoughts, and I finally moved on. Later I met my current gf. It was all lovely and like a dream come True. We shared the most romantic bond, and Finally I had decided I'll marry her. Until one day, where we had sex and were lying down naked and having a little love talks post sex, wherein she called me by her ex's name. I was confused and obviously angry. She reacted telling me that be happy that i didn't call his name during sex, why are you so angry about it? We fought and sorted it out. I apologized for my anger. But my paranoid mind refused to give up. Days later, i found out she used to hide WhatsApp conversations with guys. My paranoid mind refused to give up again.I checked her phone after taking her consent and discovered that she was in a relationship with another guy after we started dating. The guy whom she was in relationship with, I ended up talking to that guy and found out that They had broken up like 8 months ago apparently. We were dating since more than a year. Now if I look back I dont know whether it was all a sham. I really dont know what to do. I haven't confessed to her that I know about it. And I dont know what to do. Pls somebody help me out.