Leave - simple as it sounds, but it aint. Honestly, just leave. Hanging around, is causing more damage to YOU.
Its at this point you need to be selfish. Think of YOUR wellbeing.
So it didnt work out - ok - you gonna cray for days on end, but its NOT worth the impact it has on your life. Like everyone said, be happy it happened early.
if she doesnt wanna leave, YOU leave, but just stop seeing her. Sounds narcissistic to me (her actions). She knows the hurt she is causing you, and her staying around is playing into that... making her fer like you still want her (the questions you have and the look you give her). This is TOXIC! and it can ruin your entire life, so take everyone's advice and just walk out.
Had a good friend actually load his car with his clothes and drove to another province - left everything behind. 7 years later, the guy is happily married and living large. It was all possible by self love and focusing his emotion on something productive... he is better off (financially and emotionally) `now than before his divorce.
All the best... remember, you need to be ok yourself firstly -- unless you that guy that won millions after his partner left him

kidding!!!