Friend is freezing me out?

My best guy friend and I are extremely close- at least we were up until he started dating his latest girlfriend. We'd chat once a week, usually meet for a drink or just hang out at his apartment or mine and watch tv, play cards, etc. Sometimes alone, sometimes with mutual friends. But for the last 2 months, he's completely pulled away. He doesn't answer texts, doesn't text me, rarely answers calls and if I suggest grabbing a drink, he claims he's got something going on every night of the week. Yet he still has time to see our other mutual friends. We didn't have a fight, I don't have a problem with the new girlfriend- I actually really like her and she seems to be fine with me.

We've been friends for years and have both been in and out of relationships in that time- so it's not like it's a new thing affecting our friendship and he's never pulled away like this before.

I just don't get why he's pulling away and it really hurts. I mean, he says he has no time to hang out with me EVER but then I hear about him hanging out with other mutual friends. OK, granted, they're male friends, but it's never made a difference before so why should it now? I'm not really sure what to do- I never get the opportunity to talk to him one-on-one, so it's not like I can confront him and ask why he's being like this.

Any thoughts on why he might do this?

And we've never been romantically involved btw...
Friend is freezing me out?
Post Opinion