
That's what i would do first, though i am man. I cant imagine that a gal that i have cared, concerned, loved, cherished for 4 yrs would go and sleep with others guys and or betrayed me. It's really like Drilling thru my heart!!!!
On impulse, i would thought of finding anygirl and f**k her or even get a new girl!
But!!!!!!!! I wont do that!!!!!!! I would seek her out and claim back things that I have put in a lot of effort and had given to her.
Then i go call up another girl that i feel that she's a liking for me....
For my case.... This is what happened. My ex likes another guy b4 we got together.Even after we got together, she still likes him, so she always ask him to tag along whereever we go. : (
I on the other hand got quite close with my present galfriend (Close as in can talk freely, got someone to talk to, this kind of stuff, friendly patonic relationship).
Then, one day, i have enough!!!!!!! During the school holidays, she wont even let me bring her out!!!!!!! Even during school days, she wont permit me to go out with her on a date with only the two of us!!!!
I broke up with her and AT THAT INSTANT, I though of my present galfriend!!!!!! The next day, i called her up and ask if she wants to go out with me. Turns out that she said YES very quickly without any hesitation! I could feel the enthusiam and warmth and joy in her swift reply.
Never knew that she had fall in love with me, when i was attached with my ex. Only 1 mth after we went out with each other, i broke the ice! I told her i love her, and she SAID Yes, i want to be with you!!!!
It was a joyous nite, it's like winning the top prize of big sweep, u could even smile while u r sleeping!!!!!!!!!!!!!!

ALAS, guys dont sucide, dont go for prostitute, dont go for one nite stand, just becos she betrayed u.
See if you can resolve the issue peacefully and hopefully a reconciliation.