Does my boyfriend like my best friend?

How can I tell if my boyfriend like my best friend who has a better body than me...and that probably my boyfriend thinks about once in a while...I don't know if he does...but I seem to catch him looking at her...ya know where at?? Or is it my imagination?? Am I insecure??? =[

You know all guys when we see a girl with good body we like it, I'm not going to lie, but my girlfriend bestfriend she is So F_ck*ng HOT.