Cannot get over it. Should i do now?

Hello doc, I was in a relationship with a guy since last 2 years.. before I accptd his proposal he tried confessing his love to me for almost a year. Aftr I came in rltnshp with the guy he used to cheat at me with his ex evry now and then. I forgived him several times as I love him alot. But even aftr 2.5 years today, I again found some chats of him and his ex ! I cried bdly but now it feels like as if I am habitual of this bhvr of his. What should I do ? Like I literally didn't react anythng aftr knowing everythng. I feel like dead inside like there is nothng left to be understood now. On askng him of the reason why he do say he alwys says I feel guilty about leavng her, and thts the reason he messags her. Do he really love me ? We were about to tell our parents about each other. Should I not ? Should I give him another chnc ? Is he still in love with that girl ? What should I do now ? I feel stucked. Badly stucked. I want to get out of all this asap now,