Sucks dude, at least you have the satisfaction of knowing she's messed up her life by getting engaged at 18 and will inevitably have a crap marriage till she eventually gathers up the spine to leave him (or he leaves her for a fitter bird) and becomes a desperate middle age creepy woman who turns up to student nights and bops about the dance floor trying to snaffle a new Tom boy and making everyone feel uncomfortable, occasionally members of the local rugby team may try and pump her for a bet but no one really wants to speak to her because let's be honest, she's creepy
Making you feel better?
Sod it mate, it'll get better, just get yourself out, get under some tart and focus your newfound time on making every day awesome.