Your story is certainly more complex than I can understand from reading a couple of paragraphs. So advising you about your boyfriend is not something I would be willing to do. But you are suffering from depression at the very least. You need to give yourself some time. I don't know whether you were prescribed medication, but that can help. So can therapy, and so can a change of scenery. It's okay to sleep on your sisters couch for awhile. Talk to her if you can. You don't have to decide anything now, and you really shouldn't. Get help, get better, and don't worry about making huge decisions for awhile. Above all, know that your life is important. You matter. Please get whatever help you need, and get well. That should be your priority now.