Don't feel like an idiot for falling in love
I know how you're feeling-you want answers and you don't really know what to do next! Just bear in mind that depression can sometimes mean we push away those closest to us and perhaps her doing this is for your own good as well as hers. Sometimes it's not the people that mean it doesn't work-it's the circumstances-other factors will always come into play. I know you'll find it hard to let go but you will get better.
You have a lot to offer as a caring and sensitive man (if only there were more of you around!) and you will learn from this experience