They go in knowing they will make the best of it, and in many cases over the course of history, the bond forms overtime, and love happens—not in all cases, certainly, but a lot more than you realize. You don't assume you just "deserve" a CEO position if you've never held another office job, and wait around for someone to hand it to you, right?
But if it happens, it happens. There's no security in dating; she's right about that. You need to at least be on your two feet and you should have a job. The Case For Settling. All you need to do is nicely ask.