My boyfriend seems to be ditching me a lot for his friends? Why?

Anonymous
So, lately my boyfriend is ALWAYS with his friends. But its only been VERY recently that he has been doing it. Its like he changed all the sudden. before, he would never want to leave my side. now, He ditches me and the plans that we have (for instance we always watch our fav. TV show on Monday nights, so there is no excuse there) I understand we can't ALWAYS hangout on MY time. but when I go out with my friends and he isn't invited I get hell for it from him, but when he goes out I don't say anything and I try to encourage him to have fun. him and his friends drink. and I am never invited to go places. He stays out usually til 2 in the morning. and, we'll be doing something like eating dinner together at a restraunt and one of his friends will call and ask if he wants to hangout and he is like "yeah, give me 10 minutes" without even thinking... and I'm just like...oooook. So I guess my real question is, why does he do that? why did he change all of the sudden? How should I feel about him leaving in the middle of us hanging out? Why do I get punished for hanging out with my friends?
My boyfriend seems to be ditching me a lot for his friends? Why?
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