Is his behavior questionable?

[Angela]

Its my bf's first serious relationship. We have been together almost 4 months. I have tried talking to him about these things, but I don't think I speak "male" very well lol He's very stubborn too....Here goes:

Not only do I think he and his coworker are a little "too" talkative but I think she's a little too nosey. The other day, he comes to my house and tells me that she asks him *mind you, this is his COWORKER* if he "has sex with his glasses on or off." That's none of her business.

He FREAKS when I go near his phone. Then I found out he deleted me from his Twitter account and blocked me from seeing his tweets. Im a grown woman so I let it slide...But considered both incidences. Finally, he tells his friends EVERYTHING about me including the sex parts AND gets upset when I tell him that it bothers me.

He's an incredibly sweet guy. I mean it. In no way am I unhappy with our relationship. I'd like to say im much more "concerned" than anything because I'd like to teach him how some things are ok to do in relationships while others aren't. Not everyone is to be trusted with your info ESPECIALLY if you both have mutual friends, are always getting hit on, and are pretty popular.

Any ideas? I don't want to damage hurt him or do I want to break up with him because I think these things are minor to what COULD be going on lol Thanks.