Quote:
I´ve had girls, that, while having a boyfriend, would agree (textually) to go out with me, this would be either by facebook, text, man, etc.. but, they really have no intention of showing up
Other girls dont even bother talking to you.
Others flirt with me intensely up to the point of having cybersex, but they never agree to a meet up.
This

Should be made into a sticky.
With that said, if I found out my GF agreed to see another guy, if I was sure she had no intention of showing up (e.g. she said I will meet you at 7 and she was with me at 7), I would still call her out on it and say "next time, you straight out cut it out. it's respectful for me, and for the other person who need not waste their time"
low-profile social flirting is on the border-line (i.e. I will not call out, unless it's repeated or too obvious). strong flirting would be a call out and if it's not a one-off occurrence, grounds for serious punishment.
if she cybersexed with another guy, it would most probably be grounds for dumping.