Hello,
Believe me, if a man kissed me against my will he would only do it once!
From what you said, it doesn't sound like she objected at all, actually it sounds like she was encouraging it. Maybe she is being truthful about not wanting it to go any further but she is certainly playing with fire. If she has admitted that the compliments and attention felt good, maybe you two need to spend some more quality time together - getting the attention from each other not outsiders.
Your resorting to violence isn't going to solve anything and you`re lucky you weren't charged with assault. SHE was standing talking with him - she is the one who is suppose to be faithful - why beat him up, she`s the one behaving questionably.
Take care & good luck

