Should I be mad at my boyfriend for missing our anniversary?

Jennaaahhh
Okay, so my boyfriend was invited to go to a cool event with his football team for a week. At first I was really excited for him. But, as I recently found out, the event happens to be on our two year anniversary. As much as I want him to go, I can't help but be kind of upset that he's still going (considering that he also had to miss our one year anniversary last year). I feel selfish that I want him to stay, so I didn't ask him to. Also, when he found out that it was on our anniversary, he didn't seem to feel bad in the slightest. Am I being over-dramatic, or do I have a right to be upset?
Should I be mad at my boyfriend for missing our anniversary?
3 Opinion