I don't like to speculate, but what I from not introducing your
gf/bf to your friends, especially the r/s is over a year and the
friends are your close buddies, it's really weird... It's not as if
after a year the r/s is still not as stable. Then these are your
buddies, if you don't tell them, then who would you tell?? Then
there's the intro of girls to your bf.. it's a little suspicious to
be ignore.
Of course, I'm not saying that he should tag you along wherever he
go out with them, because sometimes, it's really annoying, as he's
with the 'guys' club. However, if there's a group outing where
there's girls and guys, it's not harm tagging along..