When you catch your fiancée flirting and joining fansonly

I just need some advice as far as what you do after you find out your fiancée has been clearing snap history and come to find out joining fans only with someone he knows personally.

I also seen chats that he was flirting with a girl he worked with as well as the fans only girl.

He basically blocked them both and deleted his SC. But he continued to try and deny it even happening when I seen it all. I then found her on his fb and then he deleted her off there. I feel like he really just don’t care even though he says he does.

We have a newborn together and we’re planning to get married in Aug. I’m just sick to my stomach and don’t know what to feel at this point. How do you just come back from that as if nothing has changed.

I have worked hard to build trust with him and now I feel like it’s gone.

Any advice or someone who’s gone through this please.