Cheating husband

We have been married for 9 years now, have 2 boys. I never thought he could do it but in the last year I caught him twice texting girls on tinder. He said sorry and cried that he made a mistake so wanted me to give him another chance. Fast forward 6 months he went to LA on a business trip and few hours before his flight was about to land, one of his friend calls me to tell me that my husband spent two nights with his friend’s girlfriend in LA. I asked his friend how did he know and got to know the girlfriend was back with him and told him about it. She didn’t talk to me but she kept saying she didn’t want to ruin my relationship. I asked him what’s the proof that he slept with her, he says she bled on the bed because she was on her period. (One thing I know about my husband is he is very clean, to the extent that he showers three times a day but anyways) so my husband comes home I confront him, we have a huge fight, he kept saying nothing happened and they both are trying to set him because my husband tried to show his friend that his gf was after money only. I call the friend and tell him what my husband said, he keeps insisting me to leave him. I tell him I won’t do that. I text his girlfriend to tell me the truth if they had sex or no, because my husband denied having sex saying that she was on her period so nothing happened. Next thing I know him and his girlfriend block me on Facebook, block my number and God knows what.

It’s been 3 months now, and I think I am going crazy because I cannot stop thinking about what might have happened in the hotel room. I think I am going crazy, my husband denies till date and I cannot stop thinking about it. I need a closure I guess 😢😢😢