Why do girls flirt with guys that they know are taken?

[Paytn]

I think it's just that he associates with girls who act like this. I'm guessing he maybe messed around with them some before you guys were together? Maybe sit down and talk to your boyfriend about it. Just explain that you aren't mad at him you just don't get why they won't back off. It could be that he is encouraging it, but not necessarily. If he's attractive or unintentionally flirty that probably doesn't help. It is definitely a good sign that he was willing to delete that girl.