When one friend befriends another through your
introduction, soon putting more effort into that person than you do,
simultaneously making you seem less desirable and devaluing both your original
friendships. This can happen consciously or unconsciously. Notably, one does not tend to ever make any new friends for themselves through the friend poacher.
I used to be close with Guy until I introduced him to Buddy, who started inviting him out
all the time; I think Buddy is friend poaching,
especially considering I've never met any
good friends through him.