i'm a little confused am i gay or bi?

[JohnathanB]

i have always like women until recently i just started having feelings for one of my really close guy friends...im really confused because i'm in love with him and I've never felt this way about a guy before and yes i do get an erection when i think about him if that changes anything. i just want to know am i gay or bi is all because i know i'm not straight
and if anyone is wondering ive had sex with women before...obviously i haven't with a guy