No real nice way to say this - keep your shit together and man up cunt. Liking someone so much that being apart hurts bad is beautiful but 1. it's probably much worse for her than it is for you (assuming your relationship is not one sided), 2. two hours is nothing and if you can't make that work for a few months for her sake then you're bitch made.
Met my then girlfriend when she was an exchange student at my university 13 years ago, got together and after a few months she had to go back to her country to finisher her studies + other unrelated reasons and I had to stay here. For the next four years she'd come over and stay here with me for a little over a month during the Summer and I'd go there for a few weeks around Christmas because we were both poor as fuck. So out of a whole year we'd be together for maybe 60 days.
After we both figured out everything we had to figure out she moved here and we've now been married almost 9 years. We're happy, we're accomplished and we're wealthy. If you're not willing to let your fiancé sort her own life out before getting married by enduring a couple months of seeing each other on the weekends you're a selfish prick and you most likely do not deserve her.
Quit your depressive shit and don't go losing her cuz you a pussy. You have a whole life ahead of you with someone who loves you, some people have nothing in life. Help her through it and don't be talkin bout looking over cliffs and shit getting drunk every day, it's all on you take it like a man or go fuck yourself.