"Nice guy dates bitchy girl, usually for a long(ish) time. Nice girl likes nice guy. Blah blah blah, stuff happens. Nice guy kisses nice girl – cheating on current bitchy girl – but is still the good guy.

"(HOWEVER if bitchy girl kisses/shags someone else she is in the wrong. Double standards or what?!)

"Nice girl and nice guy end up together and no thought is given to bitchy girl who may not actually be that bad. No one gives a thought to the fact that bitchy girl may have just had her heart broken, but it's fine because the 'good' couple end up together in the end."