Too Selfish?

Ok, here is the dilemma. My best guy friend (of the past 17 years) and I used to go jogging together to a park in the city. Once or twice a week, no big deal. He used to pick me up after work, we would go there, have our round, catch up and go home. Last August he started to go out with a girl (GF) who is a perfect match but is screwed up in the head about every other female in this universe. Which meant that apart from the jogging all extra-activities came to a dead end. Going to gigs together, having a picnic or drinking a pint became a no-no for him, even together with her (she would never want to go out) and even in bigger groups. Their lives became his-and-hers only, radically, rudely, suddenly.
At first the abandoned friends (a few of us from high school) thought nothing of it - this is what new couples tend to do but they also tend to grow out of it slowly. We waited patiently, got together for drinks and chats every now and then, always inviting the two of them and always being turned down.
However, the jogging stayed and these were always good times, heavy talks and light giggles.

Last week I called him to remind him of the kilos to be shed and the mini-marathon to prepare for. He told me he was working late and he would call me on the way home if it was not stupidly late for the run. I didn't think we would go that evening but I left the option open. He rang after 10 to say he wanted to pop in for a chat. He felt bad I could tell. He behaved like a puppy with his tail between his legs.

-"How are you? What can I get you?" - I asked.
-"Fine, just been running with GF. She had taken up jogging you see" - he replied casually.

I'm not a drama queen. Not with my friends anyway. I might be destroyed inside but would not throw a tantrum for an audience. But this hurt me. Not the jogging but the sneaking. Not the fact that he has a GF and I have no one but the stupidity of this sort of possessiveness. And it also hurt to see my male friend to be such a sissy who would not stick up for me.
Am I just being childish about it or is the jogging really crossing the imaginary border of intimacy that is unacceptable outside a relationship? Is he doing what every normal man would do to protect the peace and quiet at home or is it something you only do out of cowardice? Whatever…