My girlfriend and my "best" friend are getting a little too close for comfort. Should I be worried?

unodostresquatro
I've starting dating this girl I met 4 years in January. We became really close, really fast. It's now at a point where she sleeps over every night and it kind of feels like she's moved in. It just so happens that I live with my best friend. So it feels like all three of us live together. 4 years ago, I introduced my best friend to the girl and for some reason he found her boring. Now he has become completely infatuated with her. He used to be one who would hole himself up in his room whenever I brought someone to the apartment. But now, he is always on the couch in the living room waiting for me to bring up my girlfriend every night. In the mornings, he'll disturb our sleep by knocking on my bedroom door and asking her if she wants to go to Dunkin Donuts (they have some obsession with the iced coffee). But whenever she's not there, he'll just go back to hiding in his room. One time him, another friend and I were drinking in the apt and he proceeded to drunk text her while I was sitting there. It was extremely awkward. And most recently, I decided to go home for a day to my parents' house. I tell my roommate this and he proceeds to text my girlfriend asking her to hang out the night I was gone. Why would he do this?

Don't get me wrong thought, it's cool that they've become friends, but every time I bring up my concerns to my girlfriend she'll simply brush them off. I find it extremely weird; it's like he'd rather hang out with my girlfriend than his best friend or any other people he knows. Am I right to be feeling this way? If not, how can I put my mind at ease?
My girlfriend and my "best" friend are getting a little too close for comfort. Should I be worried?
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