Help ladies need advise

Ok so was having a great sexual encounter with my fiancé and we was having that good drunk sex as usually and am on top I really don’t like to be because I cum fast 🤦🏽‍♀️ but I stay on then he call out his ex name. Hope off him and he got on top and I just laid there turn off but he still cum and whatever he was thinking was coming out his mouth he ain’t realized that 🤦🏽‍♀️ so he fail al seep for 10 mins he was dreaming about fucking her he put himself in my booty but was saying his ex name saying oh ya pussy feel good 🤦🏽‍♀️now this never happened before while we had sex should I be worried on top that his ex been on my Facebook page seen we got engaged on my birthday then he told she had text him the off the ring on my hand to his phone ladies should I walk away or wait to see what happens 😔 they was together 3 years before me and him met August make a 1year for but he ask me to marry him she cheated on him and it’s video ladies just to make it clear we met when he had found out he showed me the video he seen me put my ex in jail for beating on me I live above his mom in my buildings he always use to tell his mom one day she gonna have ya grand baby she laughs because I never talk to much while guys where I live we become friends and we talk to each out or relationship and one thing lead to another here we are together as a soon to be married couple💍 but anyway he was like he never called me her name and I ask why would her name be the first to pop out ya mouth I just told u called me someone else I never said his ex he try to clean it up but I know what he said what should I do