Most Helpful Guy
When I see stuff like this, I am so pleased I don't bother with social media...
Most Helpful Girl
To me, it doesn't seems like social media is in fault. He seems like someone does not respect you regardless. Think about it, if social media doesn't exist between you two, what if he makes real girl friends randomly in real life? Talk to random girls in real life? You would be still be bother which I totally understand and that makes sense. In this case, I would even thanks to social media to make him reveal how he treats you and how he is. Having social media doesn't let ones to destroy relationship unless they allow it.
And, once the trust is broken in a relationship, no matter how hard you try to trust him again in the future, it just never the same.
Good luck ;)