Someone needs an advice

I really don't know where to put this, but here goes nothing.I've been with my best bud for 13 years now. I'm 23 y/o. He's 24 though, but we are in the same college year. I am studying Medicine, and he's on his master's degree on Mechanical Engineering. We went to the same high school, even to the same college so we're pretty much inseparable.We've become roommates ever since starting college. We're both comfortable living in the same house and that didn't matter anyway. But for these past two years, I've noticed something that completely changed the way I perceived the things we do together.We have separate rooms. But when we have our binge watching nights, we both sleep in our single couch and I would wake up being the little spoon.He gets annoyed when I bring home a girl classmate to study with even when I already asked his permission about it, to which he also agreed. Reconciliation requires me to order some pizza and beers and just spend the rest of the night together on our porch.I've been single for the whole years of college life but whenever he sees a picture of me with a girl, he's become too curious that it got to a point where he stalks the social media account of the girl.I love to cook things in random times and whenever he sees me cooking, he would rest his head on my shoulder and hold my waist in both of his hands and tease me that I would make a good wife.That time when he went to an internship for a year to another city, he would call me every single day (he didn't miss even a day). Sometimes, he randomly video chats me and he just sit there and watch me study from across the room.He would randomly message me saying "I miss you" or "Wish you were here" or things like that.I don't have a car, but he does have. Before, I always ride bike going to university. But these past years, he would give me lift going to uni, and wait for my night classes to end just to take me back to our apartment.He's become more touchy lately. He massages my scalp when we watch TV, he holds my shoulder when we walk, etc. He even took really good care of me that time when I had flu.There were few things more to say, but these were probably the ones that gave me the hint. Are we going somewhere here, or are we just the plain buddies? Am I just over thinking things?I love the idea of us in under the same house, and I can't imagine living alone without him. He seemed to be anchoring me into whatever the both of us is holding on to, and I love it. I always search for his presence whenever he's not around.It doesn't really bother me putting labels into my sexuality, or into others for that matter. I've had few flings in both sexes, but never really had a serious relationship in either.He never gave me a hint about his sexuality though, we never talked about it. But we sort of assumed since we both dated girls before, and he's a chick magnet whenever we go to clubs or parties.This has been bugging me for weeks now.In this situation, what should I do?