I agree that any form of obsession is bad for the relationship,
e.g. gaming, football, and that a guy should put his gf as one of
the top priorities.
TS, Some of the guys here mentioned about your manipulative
princessy attitude, and I would like to say that's a relationship
killer too...
Perhaps there is something in the relationship between you and him
that he felt tired about (relationships with tantrum-prone girls
are very tiring), so much that he went back to gaming
again...
Perhaps you should ask him what he doesn't like about the
relationship too, instead of just telling him what you don't like
about the relationship (e.g. gaming too often)
Here, well-meaning pple like jojobeach may say "Oh my, what do you
need such a guy for?", but I feel that nobody's perfect (it's tough
to find the other perfect jigsaw piece), and sometimes we need to
work on our relationship (very much like planting a
bonsai)...
People do change, only when they feel sufficiently understood and
hence motivated to.
Good luck, gal.