If the girlfriend never complain, then I don't see why outsiders
should.
Coz I believe if the GF don't like her bf to play CS when they are
out together, she should at least voice it out. If she don't, of
course people are just going to assume that everything's alrite,
and go do what they want. I know, the gf maybe want her bf to be
happy, so keep quiet and never say anything, but if that's the
case, then its just too bad.