I didn't take my then-girlfriend to our senior prom because I knew it wouldn't last.
Was there a particular reason you didn't think it would last?
I didn't believe that she loved me after she ditched out on my best friend's party.
Maybe there were extenuating circumstances at your best friend's birthday party. Did you talk to her about it?
Don't think it matters, she never tried to contact me after we broke up.
It sounds like you've both moved on and that's okay. Don't focus too much on the "what ifs" with your past relationships.