that's on you then. you gotta establish rules early. if it really doesn't bother you then whatever. but one thing i'll say. dude isn't the potential threat. She might not cheat on you with him specifically. but she's watching. the fact you're not checking her on this she might feel more confident in testing you on this when it would be someone she's more attracted to. it's not about her lame friend, it's about you and her. And the fukked up thing is that once she tests you with someone else more attractive you won't even be able to say her behaviour is not cool out of principle because you didn't check her when dude wasn't a threat. She will smell your weakness and be even less attracted to you. imagine this convo:
Her: Hey babe, i'm hanging out with James, we've known eachother since forever you ok with this?
You: Naw i'm not cool with that.
Her: why??
You: cause he wants to sleep with you.
Her: But it was ok when i was hanging out with Pookie, what's the difference?
You: it's not the same that's all...
Her: it's exactly the same
You: it's not the same because he's more muscular than Pookie and is more paid than him
Her:
gotta establish rules early and remain consistent IMO...