Hi MJ
Sorry to hear that. I hope you are okay. It’s an awful situation to be in, but at least it stops the constant wondering! Finding some truth is better than questioning it in your head and not knowing for certain. You can start processing things now. Its far from simple as your emotions will be all over and no doubt your partner will try to portray his side and provide some sort of explanation.
All I can say is stay strong and do what is right for you.
Take care