if u 2 seldom spend time 2gether and there is another girl
beside him, obviously he dun see the need to spend quality time
with u, which means he might be considering of a change.
if u always niam with him, then i think it's ok if once in a while
the girl joins u 2 for a purpose.
remember this, every1 knoes girls are creatures full of jealousy.
show it when u need it, no need to hide that jealousy inside
u.