What would you do

If you were in a long distancee relationship for a year whole time believing that you were the only person the other was dealing with then y’all finally move in together just to find out that they had been dealing with multiple others both flirting and having sexual relations with

Would you talk about it and see if you can move forward

Or would you be too hurt that they betrayed you and lied ..and just breakup

This is my current situation. During the long distance part I had a feeling he was dealing with multiple women like his ex’s but he told me I was crazy but now we’ve been living together for a month and we have a better relationship together I’m just finding out about things that happened on his end when we were apart and not from him telling me either so I’ve had multiple talks to him about my feelings and how Idk if I can trust him now and all he has to say was that’s the past and he’s with me now them other women don’t matter and he’s willing to do whatever it takes to reassure me he’s all in now ...

For the record it’s 3 women he had sex with not including me and atleast another 4 he’s flirted or had a sexual conversation with in the past year.