It's my fault anyway....

Tonight, we were supposed to decorate our Christmas tree, it's our first Christmas as a married couple! I've been bugging him since November 27th as well😆 but, he called earlier and said his buddy wanted to go for a drink after work- he was looking for my approval or disapproval. I don't have many friends, or at least any that I would just call out of the blue to do something. It's not his fault that he has friends and I, for lack of a better word, just don't. He should not have to spend every waking free moment with me. He should get some guy time! So, reluctantly I said okay and told him he should go and have a good time. He told me he wants to decorate the tree in the morning before he goes to work (is it just me, or is tree decorating an evening activity?). I guess I'm now kind of regretting telling him I was okay with him going. I know there are other days but I really wanted to do this tonight, and I really don't want to be the nagging wife that goes back on what she says... So I guess me feeling this way (disappointed and a little upset) is my fault in the first place!! Would it be a totally bitchy move to just decorate the tree myself tonight with my dog? What do you guys think?