He stopped doing things for his family midway through the first season, when he turned down the money from his former partners. After that it's just his enormous ego. He always tries to justify all the horrible stuff he does by saying that it's for the family, but it's really not. He's a complete monster by the point you're at now, and it still goes downhill from here.
I don't think Walt's ever become truly a "monster". He's clearly corrupted and driven by ego and greed, but I don't get the sense he actually enjoys
doing the awful stuff he does, or enjoys
killing people or watching them die-- which to me is the real sign of a monster.
It obviously doesn't tear him up the way it does Jesse, but there's still clearly a hint of regret
in Walt when he has to do something bad. Which you probably can't say about monsters like Charles Manson or Ted Bundy.