BestGirlFriend

I am one of those people that chose to date my best friend. My best friend of ten years.
Now I've always understood his personality, I understand his ways. Hell, our birthdays are 15 days apart.
So when he gets upset about something, of course I'm genuinely concerned.
But just as I get angry and shut everyone else out in order to fester upon my thoughts of the situation(s) at hand, he does so also.
However, as his best friend I know to leave him be and allow him to remove himself from his funk, just as I would expect of him.
But here's my conflicting issue/thought.
As his girlfriend I feel as though he should be able to talk to me at least. Or maybe even more so as his best friend I would think he would be able to confide in me.
But, I guess not.
Funny how much the song by Music Soulchild reflects my issue.
I don't know whether the best friend side of me is upset or the girlfriend side.
But I do know that as his best friend it upsets me to think he doesn't feel he can no longer confide in me all bc of this girlfriend title  when before I'd always be the one he'd tell his problems to if no one else.
I texted 5 times, no answer. I waited two days no call.
NOW, he's pisssed off the girlfriend side too!
But as his best friend, I'm still concerned.
I feel like now of all times, I no longer know my place in his life. Bc I thought he'd trust me even more but it's more like he shuts me out more than before. But I deal with it bc I love him, and always want to see him happy.
But I will say it hurts me to see him this way. To know I can do nothing is honestly fucked up. I feel more helpless than when I was just his best friend. I feel like I do nothing for him if I can't cheer him up or at least be the one person he tells his problems to...
He sees no problem in what he's doing bc as his best friend I would allow him to kind of shut me out for a while before I "bugged" him again.  But now it just hurts.