10 points! I'm scared that my ex will get raped by his new girlfriend?

[Girly Q]

My ex boyfriend and I were each others firsts and together for a year and a half before he "fell out of love with me for fighting too much", fights that were mostly started by him. He and I took a break for 2 months, where he blocked me on all social media and other sites before re-adding me and deciding to Skype me again starting just this Saturday.

He has a new girlfriend that he's had for about a month now. He's only mentioned her once and said that he is "in a relationship" with her. He doesn't mention her around his friends and never mentions her on Facebook (they don't comment or "like" each others posts/photos).
I don't know if she's a virgin or not (he and I are), but two of her exes are my friends and they've told me that she likes to be extremely touchy and will do anything to get her hands on a man's ****.
She's had 5 boyfriends and a girlfriend (the longest being a month) while my ex and I have only had 1 relationship.

However, he and I have agreed to become best friends and we talk every day for hours. We've only fought once (over his girlfriend blackmailing me), but other than that he knows that he can come to me for comfort, help and anything else he needs.

I told him that I trust him, but he claims he doesn't trust me because "I told myself so". He says he's going to think it over.

I still have feelings for him, but I don't know if he knows. More than anything, I want him back but mostly away from his new girlfriend. I've become extremely depressed and paranoid over what she might do to him...

1. How can I bond my relationship with him?
2. Will his new girlfriend last any longer?
3. Might he come back to me?

Thanks! And please don't tell me to move on, I want to help this guy.