Mercury, sorry bout this happening to you, man. I haven't gone throught exactly what you are talking about but a close friend of mine just went through EXACTLY what you've gone through-- same feelings b4 and after.
It's weird and twisted man. Sometimes I get irritated and frustrated many times by how women can have such an effect on us guys. But to be honest, I personally don't think I could stand this place if there were no women around. Just like that saying, "Women, can't live with them, can't live without them" (or the other saying according to
PKRWUD 
)
NO DOUBT man, this is easier said than done, but it's good when you know when to let go. And of course, there is no way the way you feel about her will suddenly change tomorrow morning when you wake up, but give it time and BE PATIENT FOR THE ONE WHO YOU'RE SUPPOSED TO BE WITH.
I know you love her. That is not hard to believe, but
Merc, you guys are not married. Too many times people feel that if they're in a relationship, they GOTTA make it last until death. Now when you get married, that's when you have that obligation (although some may not feel the same way I do).
Find solace in the people here at MW, your friends where you live, your family (no matter how weird they are
), you car, work, whatever. Women are not the only good thing in this world (even though I love them all to death
) and you will find the right girl soon. Be strong and patient and Godspeed to ya. We care about you dude.
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351W-powered 1979 Ford Mustang notchback
Stock 5.8L under custom made 4" cowl, C4 w/ shift kit
Holley 750 cfm, Edelbrock Performer RPM intake
1 5/8" MAC shorty headers, Al driveshaft
2.5" Off road H-pipe, 2-chamber Flowmasters
Front: 225/60/15, Rear: 255/60/15 Eagle GT II
Weld wheels (15x6;15x8), 8.8" Rear w/ 3.55s
14 x 4” K&N air filter.
Only a few months b4 Project FOX begins!!! 
"Red, thou art my companion. Hasten now your quickened metamorphosis to Green that I may conquer all who dare abide there beside me. May they be left thither behind burnt black." ---Fox Body