Am I wrong...?

Hi ladies....I was wondering if I could get some advice.

my boyfriend and I have been together just about a year now. he has been invited to a friends wedding, and was asked to be a groomsman but didn't tell me, thankfully he doesnt have to be. he said in the beginning he will wear his dress blues (hes in the military, and I haven't seen him in them yet) and that I will go too. now....hes saying he will go alone, and go to the reception too. Am I wrong for being upset at this....? he doesnt understand why I'm upset (I feel like I'm not good enough to go with him, and I was getting excited that we will actually get to take a nice picture together)

if you were in my shoes....would you continue to be upset or just let it go? I'm at a loss. I've tried talking to him.