I am a girl and I have a girl friend that's the boy in our relationship. And I have this roommate that's also a girl, her and my girlfriend get a little to close at times like talking about their life and goals together and I feel that's something me and my girlfriend should be talking about. They tell me its just being little and big sisters, but I don't know if I want to believe that. Also sometimes their in the living room just talking and laughing and leaving me out, my roommate textes my girlfriend mostly all day something I don't even do.I just don't know what to do anymore she tells me that I'm to jeolous.:mad:is that something I should think about or am I just thinking stupid?

I don't really understand it either LOL. But,
I would guess what he meant is that he has a girlfriend and they have been going out for 6 months now. His roomates which I would guess another guy who always talk to his girlfriend whenever she's visiting him in the living room. He thought that she should talk to him instead of the roommate all the time. When he wanted to go out to get something to eat with his other roommate, his girlfriend always make excuses like: Ohhh I will stay here, I want to go to the restroom etc etc... so you guys go ahead, I am going to stay here. This excuses made by his girlfriend in attempt to spend more time talking with his other roommate that she might like. Now, he wants to know if he is wrong for thinking that way or feeling that way...

Kind of weird. Your girlfriend hooking up with your roommate. Talk to your girlfriend about it and see what she says.

From this vantage point,it is hard to say if there is any reason to be concerned.
If your GF has earned your trust that I suggest you remind yourself of that when you are feeling antsy about her friendship with your roomie.
I would make it clear what you think the boundaries should be ,to both of them ,and ask them to respect those boundaries.
If you are feeling uncomfortable,your feelings should be validated.

Had to spread the rep Artlady, but I agree that boundaries have to be established, through some honest expression of feelings, for the relationship to have a chance.

Why are you not glad that your roommate and girlfriend get on?

Try to look at this as a good thing, stop over-thinking it.

This kind of behaviour is controlling. Both your girlfriend and your roommate have the right to personal relationships outside of you. Being friends with someone doesn't take away from you, it adds to her.