Dear Bitter Guy -- Relationship advice for singles and not-so-singles

Dear Mr Bitter Guy, I need dating advice ...

My question is the following, I was dating this bi girl, after a while she broke up with me because her ex came back and she defined herself as a lesbian. She tells me that she loves me and that I am the perfect guy for her if she wasnt a lesbian...So my question is what are the chances of her coming back to me? Is it smart for me to wait for her? What should I do from now on?
(I love her more than anything in the world)