<human>: I am a 15 year old boy and one of my best friends(15 yr female) has a new "bf" (idk if it is offical yet.  He is a 16 yr old I believe). Everyone seems to see him as a nice guy and I was friendly with him.  But once he started to notice me with his gf a bunch he started getting more hostile. (examples: When we joke around on fb he acts like I am seriously insulting her and gets overly defensive.  Acts like I am mean to her ect.  And is just over all hostile to me.). He has never actually said anything hostile to me but he definatly doesnt like me.  How can I comunicate that I am not a "threat" as far as trying to go out with her while still holding my ground.  I mean, she is one of my best friends.  Am I over reacting?

Can you give me the gist of the text in a nutshell?
<bot>: How do I comunicate to my friends bf that I (male) and not a threat to taking his gf while still holding my ground as close friend?