one of my friends is the same, as soon as she gota boyfriend she used to come out with us and our guy friends, and lie to her boyfriend, coz he would crack it... he's very over protective.....
anyway she doesnt come out anymore, coz its hard for her to lie, coz he calls her every hour or so to see where she is.. (freak) lol
this has happened with two of my friends.....
my ex, i used to tell him, he didnt know the other guys so thats what made him like umm and ahhh about it, but once he met them it was fine i suppose....
but yeah...
friends turn stupid when they get into a arelationship lol end of story..