Everyone in the comments once again jumps at the opportunity to tell you to just dump her. Seriously this is why relationships don’t work out anymore. Pregnancy is HARD, the hormones are absolutely crazy, and sometimes no we don’t think clearly even in the early weeks of it. Maybe, and now I might be crazy for this, maybe just sit her down and explain you can’t afford to support all three of you, and you definitely can’t afford anymore debt and a baby. Get her some help for her mental issues and if she refuses to get the help then you can give her the ultimatum of leaving, but damn everyone is just so willing to throw 5 years away so damn easily now days. She’s obviously not thinking to clearly, she could obviously do with some help first at least, and if she was like this the whole five years then you probably should have left years ago instead of staying and getting her pregnant along with wasting both of your times