If homie and the chick are sexual active then yeah he has the right to ask her if she dealing with other people. But if not who cares, if you both are not mutual exclusive.
i dont see how this isnt brought up more often
if you having sex with multiple people at a time, "marriage" and "exclusivity" means nothing to you. You are basically everyones wife/husband/concubine when you do that
in the past this behavior is what everyone linked with STDs and other unsavory baggage. Anytime I've dealt with a woman who showed signs shes with someone else I just treat her as someone with someone else and not my problem
if i did the same to her, she'd have every right to not want to deal with me
when you sleep with a woman/man with multiple partners you are basically sleeping with all of their partners too
thats why its selfish and poisonous behavior that ends up festering other kinds of mental illness associated with how you view yourself (IE the one you wanted got away so now i'm going to treat everyone the way ive been treated type logic)