I would agree with above that marriage for the sake of it is probably not the best idea, especially with the stress of the changes and finances. If you need the support right now I would be considering the group home, or an intensive outpatient program that can allow you to receive the care you need.

It may impact on your relationship in some ways, however if you and your girlfriend are meant to be together I am sure you can find a way to remain friends and re-evaluate your relationship later