I understand the urge to want to kick his ass.
BUT you don't seem to be considering the fact that SHE also participated in this, she kissed him too. It's not like she is completely innocent.
Unfortunately it is the tendency for us to want to have a go at the guy. Going and getting in a fight with him isn't going to help things except bring you trouble. It's better for you to just move on and be with these other girls. It's awesome you are much more confident now and have alot of attention... what if the best revenge was moving on and living the best life you can?!

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