UT, after a long friendship/partnership there has to be some sense of loss and maybe a little envy of half the team striking off in a new endeavor. Especially if they show extreme excitement and enthusiasm, you're bound to have those "What am I, chopped liver?" feelings.
But don't dwell on the past, learn and profit from it. Then when in a year or two you're an internet mogul with a trophy wife, you can brag to the rest of us losers.