Bin Laden was trained by the CIA????

i’ve never heard of this one until i became friends with someone who is muslim. i’m very open minded and love learning about different religions so i asked him to teach me about it and i thought it was beautiful. i told him how muslims are very misunderstood here in the U.S and he said i know it was because of 9/11 and that osama was actually trained by the fbi and turned on us? and that all the jews that worked in the tower just so happened to not be there that day. i thought it was interesting. have any of you heard of this before?