Breaking up/ending relations with a co-worker....

[MCT]

ok, it's a relatively long story, but I'll give you [Spaceballs] THE SHORT, SHORT VERSION [/Spaceballs]

- met girl in November at work
-began dating girl in mid December
-hit it off very well, had amazing chemistry, had so much fun around each other, and the sex was amazing
-girl tells me about ex-man who she's known for 8 years that moved down here to Florida with her from Connecticut that she still "sees" occassionally
-I tell girl she has to let him know about us, it's only right and fair
-she tells him, he begs her not to be with me, I beg her not to listen to him (he's a piece of shit), she does anyway, causing us to break up and she decides to "work things out with him"
- a week later, she tells me she still cares for me and likes being with me. I foolishly buy into her game. We maintain friendly, sexual relationship for next 3 months
-I am unable to sustain the facade that I'm happy with the situation. I tell her I can't continue to be sexual with her knowing she's going back home to him every other night. It's disgusting to me.
-She ends things with me totally, and tells me she's moving in with him at the end of this month

we work together. We are separated by a big wall, but she's really not that far from me. I loved this girl. I'm having a really hard time dealing with the fact she chose that bastard over me. I'm considering putting in my two weeks notice, as seeing her every day is both angering me and depressing me. Someone please talk some damn sense into me.