I wanna to ask about your opinion. If you had a partner and your partner had a cousin of the opposite sex that your partner is close to, would you be jealous? And is this an important thing to argue with your partner?
I might get jealous if my girlfriend spends more time with other people than me, but that applies to everyone. Since you're placing a lot of emphasis on cousins in this sentence, I believe it's important to take that into account. Hey, that's the point; they're just cousins, after all.