My man's ex is psycho!

My man and I have been together for over 2 years. A year ago, she tried convincing him her daughter was his and was asking for a dna test and whatnot. Turns out, the 4 year old daughter belongs to the guy who she initially thought was the father. Problem solved. However, my man has an old email he used to sign up for sketchy stuff (he's paranoid) and hasn't had the password for quite some time. Recently, we've found out she has been using that email to create fake accounts (Facebook, pof, porn hub etc.) In hopes that I'll find it and leave him since she wants him back so bad. At first I was skeptical and we had a huuuge fight and I almost left him. But after hacking the email and receiving and email for his instagram password to be changed, as he was sleeping next to me might I add, I know that he was telling the truth when he said it wasn't him. What the hell can I do?! I'm about the go bust down this bitch's door! I'm so frustrated.