Should I break up with my girlfriend if she flirts often with other guys after you confronted her about it already not to flirt and she promised she wouldn't ever flirt?

It really matters how severe the flirting is. If she flirts minorly with a lot of people, it may be because sh just naturally flirts with people. she flirts with everybody. kinda like me. if she concentrates on one person and flirts heavily with that one guy, then you may have a problem. dont break up with her, though. talk with her first, and ask if she has feelings for this person. talk it through and see what happens. good luck!