Bros in open relationships, are you ok with your partner having fwb?

I’m in an open relationship and I’m fine with random hookups because I know they’re meaningless. I struggle more with my bf having a friend with benefits. He texts and snaps him almost all the time. Bf has him over on one of his days off about once a week. They’ll hang for a couple hours and play video games/fuck. It can be really hard knowing that he’s texting the guy making plans to see him the next day when he’s sitting right next to me. If bf and I haven’t had sex in the couple days leading up to them hanging out, it gets in my head even more.

I’m curious to hear from other gaybros - what’s your comfort level with fwbs? Any advice how to work through jealousy around this?