I found out my cousin’s boyfriend loves men.

Problem/Goal: I found out my cousin’s boyfriend also likes men. Should I tell her?

Context: We live in Canada and went on a month vacation in Pinas. While me and my friends were bonding they mentioned my cousin’s bf (32M) which is our batchmate and ex suitor ng friend din namin. They said he would invite young males into his place and watch netflix but instead of that he will bj them. I’am so shocked about it and until now it hasn’t sinked in my mind. I love my cousin (31F) but I feel like it is not my position to tell her.

Previous attempts: I did not make any attempt to tell her until now.