Boyfriend Can't go to Prom

My boyfriend told me that he can't go to prom, it's my jr year and this means more than anything to me. Now I feel like he has ruined my only escape from my difficult life and the reason he can't go is because of sports. Why won't he choose me instead?   I just don't know what to do because this was the one thing I needed him to be there for and he already doesn't choose me for a lot of other things.