I'm gonna go out on a limb and say your GF was much more than "just" a GF. My BF and I have been together for almost 5 years, and we still consider each other BF/GF, but we know we are much much more than that to each other.

I have a friend that is currently going zombie, and it kills me to see her this way. But, she won't do anything about it. She's obsessed with this guy and is always at his side even when he doesn't want her to be. He plays mind games, and she falls for them. She's thrown away her life for this stupid idiotic boy, and she doesn't even care. The difference? It sounds like you've been with this "GF" for a long time, and you guys had plans. He straight up told her "I don't see myself marrying you in the future" and she's STILL barking at his tree.

If I were in your shoes, I'd have to ask myself "Is this really something that can stop me from being happy, or can I find a way to make the best out of it?" I tend to always look on the bright side, so maybe my post is coming across too happy. Lately I've had to ask myself this question a few times, and it seems to be working out.