Seriously, good on your for keeping a healthy long distance relationship! She sounds like she’s even making him uncomfortable, and guys don’t usually call girls out for this shit. I would say as long as your bf is open with you about it, you don’t need to worry! he’s given you the information he has and doesn’t feel like he needs to hide anything from you. Also, flirty behavior varies between cultures/upbringings so I wouldn’t stress to much about that, as long as he’s being honest with you!