My fiancé continues to contact his exes behind my back. What should I do?

So I've been with my fiancé for 4 years, engaged for 1. We've been living together for the past 2 years, and right when we moved in I had a huge bomb dropped on me. His most recent ex sent me a message saying that he'd called her a year into our relationship to say he still loved her and basically that... show more So I've been with my fiancé for 4 years, engaged for 1. We've been living together for the past 2 years, and right when we moved in I had a huge bomb dropped on me. His most recent ex sent me a message saying that he'd called her a year into our relationship to say he still loved her and basically that I should watch my back because he's not to be trusted. This obviously messed with my head big time. I confronted him and he admitted to having called her, but said it was only because he'd ended things badly and was trying to reconcile for that. He denied saying he loved her and everything else she mentioned. I was devastated that he kept the phone call from me, but tried my best to let it go. The entire first year of us living together, I experienced sleep paralysis because the whole thing actually stressed me out to such a degree because deep down, I couldn't help but feel like I was still being lied to - and if there's one thing I hate, it's dishonesty. Well, I found out that for a significant chunk of our relationship, he was comparing me to this girl and basically humiliating me big time. And he waited until AFTER he proposed to admit that he did, in fact, tell her he still loved her. I cannot even tell you how deeply this all hurt me. He said it was all foolishness on his part and that he's never regretting anything more, because with time he's come to realize that I'm the only woman he's ever really loved and it was all just a terrible mistake.
Update: I forgave him (stupid of me, perhaps) and decided that since we made a commitment to get married, that we leave the past behind and move forward having hopefully learned from all this. Well, I find out that a couple of months ago, he reached out to yet another ex via email (a different girl this time, but still an... show more I forgave him (stupid of me, perhaps) and decided that since we made a commitment to get married, that we leave the past behind and move forward having hopefully learned from all this. Well, I find out that a couple of months ago, he reached out to yet another ex via email (a different girl this time, but still an ex). When I asked him why, he said it's because he missed having conversations with her since she was the only one he could have certain intellectual discussions with.
Update 2: I ended up having a total breakdown, like sobbing uncontrollably because I just couldn't believe he could be so careless again when he knows how much he hurt me in the past. When we had agreed to no more secrecy and betrayal. And while I'm crying and freaking out, he had the nerve to scream at me at the top... show more I ended up having a total breakdown, like sobbing uncontrollably because I just couldn't believe he could be so careless again when he knows how much he hurt me in the past. When we had agreed to no more secrecy and betrayal. And while I'm crying and freaking out, he had the nerve to scream at me at the top of his lungs and leave me alone on the couch. I've honestly never felt so low and just needed to vent since my partner is sound asleep right now without a care in the world.
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