<human>: Can you give me the gist of the text in a nutshell?

So my Ex (25 F) and I (26 M) dated for just over 4 years, we've been separated for ~4 months now.  I can't stop thinking about her, and I want her back very, very badly.

The problem is that I have this deep-seated feeling that we're just not "meant to be."  Like, part of me feels that it isn't ultimately going to work out.  It's this very feeling that led to our breakup in the first place. . .things just weren't really great between us, so we broke up somewhat mutually.

I feel like such a fool.  I had it MADE.  This girl is beautiful.  Literally a model (small-time), smart, sexy, chilled out, 4.0 at the college we both graduated from, and a good job now.  We share a sense of humor, we have similar interests (though, a lack of shared interests is one thing that has concerned me). 
 

I think about all these things and all I want is to take her back into my arms and be with her.  But the fear that we'll just be wasting our time, headed towards the same cruel fate that we've just gone through, scares me.  It's the most rotten, conflicting feeling I've ever had.  I want her back SO BADLY, but I'm not sure that I can ever love her the way I did for the first 2-3 years, before the feelings started to fade.

Can someone with more life-experience tell me what I should freaking do?!  Either way I slice it right now, I fear I'll regret it in the future.  If I stay with her I'll wish I had moved on.  If I move on I'll HATE myself for letting such a catch go.
<bot>: Had been with my Ex for 4 years, separated for 4 months now.  She's a beautiful, funny, smart girl.  I WANT to love her more than anything else, but I don't.