Bless your heart. I'm sorry you got hurt. But the fact that she has severe BiPolar tells me that even IF she came back, this would happen again. And from the sounds of it, I doubt she WILL come back.
Your best bet is to just get over her, and get on with your life. You're a very intelligent man, and I'm sure you'll find someone who will be TRUE to you in every respect. Find someone who doesn't have a lot of issues, who isn't BiPolar especially, and who DESERVES you. You are a caring, kind, person and you deserve to be loved. Don't sit and wait for her to come back, only to be hurt again.
There are many women out there who would love to get to know you, and spend time with you. You just have to look in the right places. Best of luck and please let us know what happens, okay? I'm pulling for you. And please take good care of yourself. Don't sit at home pining for her -- get out there among people. God bless and good luck! Hugs, Lee