[header] How to stop other girls flirting with your boyfriend [title] Step back and look at the situation objectively. [step] When looking at a flirting situation, it often takes two to tango. The other girl may initiate the flirting with your boyfriend, but your boyfriend may play a part, too. 
Try to look closely at their interaction to see if they're both flirting or if it's really one-sided. [substeps] The point of analyzing the situation is to see how to better deal with it.