stuck.

So my boyfriend spends almost all of his time with his friends. He hangs out with them at night, he gets lunch with them, he walks to class with them, he goes to football/basketball games with them, literally everything. He's even living with 6 of them next year. There's almost no time left for me, and every time I ask if I can come along he says "it's a guys thing." I've tried just hanging out with other people and ignoring it but I can't anymore. I've tried to talk to him about it and he just doesn't see the problem. He always blames not hanging out a lot on school and that he's studying all the time. And if it was school related, by all means I would have no problem with it. But it isn't at all. He and is friends have a group message and they are constantly texting it, and my boyfriend is constantly checking his phone while we're together. It's so annoying. Is there anything I can do to make him see the point without creating a problem? Thanks guys!
EDIT: thankyou all for your responses, however I am not going to break up with him. This has not been a problem forever and I hope it isn't one for much longer. I was not looking for whether I should stay with him or not, I was looking for how I should approach the situation. He and I have a great relationship other than this, we always have fun when we're together. I know if I tell him he needs to spend more time with me he'll just get pushed away further. He's a guy who likes to be able to make his own decisions, not have someone make him do things. How can I approach the situation in a way that makes him start to come back naturally?