Husband history of infidelity

My husband went to a very large highschool so he is connected to a lot of people . However since I have been with him, he constantly stays connected to certain women that he either dated or tried to date from his highschool. He has reached out to these women behind my back numerous times in the past. Recently I see that he is following a female on instagram that he was flirting with and trying to date from his highschool. I read messages between them last year He said that he would delete her and that nothing was said or messaged but of course I don’t believe him . I want a divorce because I really had enough of the sneakiness on social media and offline. I feel that as a husband you should not keep a woman /women around that you tried to date before. It opens the door for whatever. He gets mad at me and says if I leave him he will make things worse for me 😢 said if he divorced and he has to move out he will call the utility companies and cancel bills that he paid 😢 I feel so trapped