Straight boy w/ gf flirts with a gay guy?

ok so my boyfriend and i have been dating for 7 months now. he tells me he loves me and i do to love him, i am biual and he is straight, he has a guy friend who is gay and they flirt with eachother alot. forexample the gay guy would be like im longing for a kiss over texing, there were alot of coments saying i will kiss you and stuff then the last comment was from my bf saying back the **** off, he is mine.... this really worries me, me and the gay guy are close friends and my bf and him are bestie. i konw the guy has feelings for my bf and i do told him, but hes like oh its just playing around... ppl at my school always ask if my bf is gay or , and my bf gets mad when they ask him that, i told him stop flirting with the guy and they wont think your gay... and yea... i dont know what do too.... hmm... should i be worry that the guy is tryign to steal my bf away?? uh its so ugh! when i read their texts, because me and my bf share a mys, it hurts me alot, and iget really really jealous.. and i dont want to tell my bf to stop hanging out with him, becuse taht is wrong, he has his rights to hang out with who ever he wants but it just really worries me..