Why would my boyfriend take money from someone else and not me?

My boyfriend has a account that both his friends and I are on and he couldn't afford to pay it on time this month and I asked if I could pay for it cause he really needed to use it, plus I use it as well, and he said no and wouldn't accept it nor tell me how much it was at all, but his friends offered and he accepted it without thinking twice. Why would he not let me? Nor let me get him anything, but his friends are allowed to?
Why would my boyfriend take money from someone else and not me?
Post Opinion