So I live with my boyfriend and almost everyday he's spending less and less time with me cuz he's either outside smoking/hanging out with his friends or out somewhere else. We used to be so much closer before and now I feel were moving apart slowly. I know we live together but come on can't there be a couple of us days? I wish he'd spend the amount of times that he does with his friends with me.

Time to move on. He's treating you as though you are an old married couple. This is obviously not what you want.
What you really should do, is not be so boring / available to him. He needs to value you and not take you for granted. If he goes out with his friends, you go out with yours. You need to show him that you have a life too and you're not trapped them - unless you have kids with him :o( then God help you.