My bf’s ex still hangs out with his friend group

Problem/Goal: My bf’s ex of 5 years still hangs out with his friend group a year after they broke up

Context: Less than 6 months pa lang kami ni bf and in an LDR set up. Di pa kami both nakakauwi ulit sa pinas kaya di pa namin nai-introduce ang isa’t isa sa friends namin. Now, out of curiosity, i checked out his friends’ profiles and later found out na pag may mga hangouts yung group nila together, kasama pa din si ex. Bf’s friend group consists of his high school best friends and their respective partners. I know close si ex sa mga girls dun and wala naman ako magagawa kung may nabuo na silang bond, but the fact that yung mismong friends ni bf ay close pa din sa kanya, it doesn’t sit right with me. Valid ba tong nafi-feel ko?

Previous attempt: None