could this marriage work???

[sugar m]

i had a girl...3 years, made alot alot of mistakes, argued over pity things, made her cry, shouted, left and came back but we also had some amazing times!!!! its was pity but added up, now iv realised so so bad and want her back but shes engaged.
she says that love will grow after marriage and just doing it for the parents. i asked if she loves me, she started crying
I want her back soooo much and im realised. how can i get to change her mind??? get a proper job, stop smoking, what??? there must be a way, i talked to her and she said its too late, everything is set in 2 months....what should i do???? i cant just leave it, iv realised too much
I really really need her back...any solutions to get her back??? i mean shes marrying someone love will grow after marriage,what kind of thing is that!!!