Would you be pissed?

This Wednesday is me and my SO's 4 year anniversary and he already made plans this weekend to go to a conference for work (which was not required and is something he is doing on his own time). We just moved to a new area and I have been telling him I want to go out and meet people and actually had a chance to a couple of weekends ago but he didn't want to so we stayed home. He promised to take me out a couple of weekends later. Promise broken and he never took me out. Now, he agreed to go to this stupid conference  and I am furious about it because he is being selfish and not even asking me how I want to spend our anniversary weekend. And he said If I don't want to go I don't have to he's still going. This is bullshittttttt!!! (Sorry for incoherent blabbing really pissed)... Would you be pissed????