Two choices: fight or leave.
I suggest you find yourself a nice man who's interested in you and won't cheat you the second you're looking away..
If it's a matter of pride, fight for the guy. HE doesn't sound much like a catch, but if it's important for you, do it. You have the advantage of living very close to him and of knowing him sooner, so it's relatively easy to become his main point of interest again. The question is: "What good will it do you?" I remember a chain letter about what every woman should know: every woman should know when to try harder and when to let go.
Good luck, whatever you decide