Boyfriend added girl from his trip

Boyfriend on a trip to ATL for a music festival. Told him my boundaries and that includes not adding females from down there cause there no reason for it and it’s something I hate that he does. Adding random females esp ones you meet on a guys trip to me is highly inappropriate. He told me he wouldn’t and that he wouldn’t be entertaining females while away then I saw he followed some girl from ATL who doesn’t even follow him back. I looked at her story and it looks like she’s in the same scene that my boyfriend is in down there. I’m kind of pissed but because he’s away it’s out of sight out of mind what do I do? I already asked him about it and he hasn’t responded.