Ok i like my best friend(male) who likes my other best friend(female)?

okk me nd this guy are realllllllllllllllly good friends nd he even said it himself dat we best friends nd its pretty obvious that he has feelings for me and my other best friend who's a girl wants me to go for him but i wanna just stay friends nd now i think that i actually do like him buh da thing is dat he is my best friend's ex nd she doesnt care nd shes totally over him but he tol her today dat he styl lieks her nd i think he really does, buh i also think he likes me, nd im like totally liking him rih now, wuh do i do???