boyfriend vs. close guy friend, they don't exactly get along Options

[*suddenly she*]

my boyfriend J is a junior in sr. high school and i have a close guy friend who's like my younger brother, K, who is a sophomore at my school (my age).

whenever anything happens at school that involves K and i being friends, like just how we got in trouble today with the algebra teacher for listening to music, J gets irritated when i tell him. it's a habit of ours to just let each other know what goes on at school. J tells me that K always acts immature and like a pansy. today when we spoke, he told me he didn't know any other juniors who liked him, and the fact that i am close friends with K bothers him. he said that we flirted with each other without any bad intentions, and that bothers him as well.

personally, i don't think i do anything like that. i used to be kind of uptight about complimenting my guy friends, but i've loosened up lately and laughed more with them. i honestly dont' think i am a flirt... i try to treat all my friends the same way, except i give J more attention.

this conflict between J and K has gone on for a while. i haven't done anything to prevent it, because they usually don't even talk, but he disapproves of how close K and i are. K doesn't have a low opinion of J, openly. however, J has not tried to convince me to stop being close friends with K. J only lets me know he dislikes him and leaves it at that.

advice would be great.