Am I overreacting??!!?

Okay so me & my bf have been going out for 3 almost 4 months now. The first month we were really lovey & close & he spent all of his time w/ me. Now we are still close but spends more time w/ his friends. Now I don't have a problem w/ this but he has these 2 really close friends who are girls & they are talking like 24/7 & he says they are a trio. I know I must sound like some physco b**** but I'm just really worried. Also I see their comments on Facebook & their always posting things on his wall & liking things on his profile. Also they went to the movies before. Also when he first got his Macbook they would always ichat on aim & their always video chatting & everything. I know that he has a life & he has friends just like me but these 2 girls just seem so fishy. I really dislike it but I'm not sure if I can do much about it. I just don't want to lose him....thats all. Plus on Facebook their always talking about him while their on the phone...doesn't that sound suspicious??!!