Search Results: ex is sleeping with my mom

My ex and I were together for a year and a half. I flirted with another girl through text. But we stayed together. She started canceling plans on me last minute a while after that so I got mad and flirted with another girl through text. She stayed. Months later I find out she's been sleeping with her coworker. I say ok fine, we're even and she agreed. However I catch texts and fb messages from him that they're actually a couple. We break up. She then apologizes and wants another chance. I say lets be friends first. Everything goes great until the guy texts me saying to leave his gf alone. I call her out and she admits it. Saying that he said he was gonna kill himself (he has two kids) if she broke up with him. But she says she'll do it for good. Then I find out from 3 people that she never did, and she's now living with him until her mom gets a new house because they were living with their grandparents house with lots of people. She denies it and gets tired of talking about it. Even tho her phone is off at certain times like clockwork. Should I kill her with kindness or go off? Or not even bother? Thanks for your time!

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My blonde girlfriend came back from university to visit me and her parents and she found a long brunette hair on one of my pillows.
She was furious about it and thinks I am cheating on her now. I adamantly denied this but she didn't believe me and said she was going to search the bedroom to make sure. I said 'go on then' knowing I had absolutely nothing to hide.

After doing her own female forensics she unbelievably found another two brunette hairs in my room. One dark hair was under my bed and another in my sock draw right at the back.

I have two explanations for this….
1) The hairs belonged to either my mom or sister (both however have been away travelling Asia since mid June unfortunately).
2) The hairs could be 1-2 years old and belong to one of my ex girlfriend's…

I've tried explaining both of these theories to her and she refuses to believe either. She is accusing me of sleeping with one of my work colleagues who has black hair and recently added me on Facebook.
Anyway she went back to her parents house crying yesterday and hasn't replied to any of my texts or calls since. I don't know how to prove my innocence and I am fighting for my relationship here, that's if it isn't already over. I definitely haven't cheated! Please, I need help here. Is she being irrational or would you have trouble believing me too?