Seriously, don't flirt with guys that you don't have any intention of making into a serious relationship. It is just downright annoying and you are wasting our time. After all, we could be chasing girls that are actually available. Why break our hearts? DO NOT FLIRT WITH BOYS IF YOU HAVE NO INTENTION OF SEEING THEM IN THE LONG-TERM.
About your ex: you two broke up, so she has all right to kiss whoever she pleases. Why would that stop you from getting back with her? As for the flirting while you're dating, maybe she does it without realising it; some girls are flirty by nature, though they would never take it further than that.
To answer your question, I don't think it's okay but it's definitely not a big deal if the flirting is innocent.
it depends really. innocent flirting maybe unknown with the girl. you said it was innocent so obviously she doesn't mean it. if things start getting serious then flirting should stop with other people. girls or guys . neither should flirt if they are commited and want to go out with the person
It's not out of the question, but I think it's an issue that is best left alone if the relationship is serious or not. To me, it's not the best idea in the world to flirt with another guy because it will give him false hopes. It's happened to me.