The short version of a very long and ugly story:
A long time ago in a galaxy far far away I met someone I truly thought was "the one" and for a period of time she felt the same way. Fast forward a few years: after all of my efforts to show her how I felt, after years of jumping through hoops to impress upon her that yes she was important, her problems didn't have to just be her problems, and blah blah blah she just tells me out of the blue she "just wasn't feeling it anymore, and maybe never did." Maybe I should have seen it coming, the red flags had been there, but I was completely blindsided.
So, what did I get for all of my troubles? If you guessed anxiety/depression, trust issues, rejection issues and a slight alcohol dependency problem you're absolutely right.
So, my overall point would be to go take that chance. To quote Gretzky, "you always miss the shots you never take." Just understand there's only so much you can do, and sometimes things are best left to happen at their own pace.
"Sometimes it's better not to touch your dreams."