At Chimera this year, I played in a couple of games where some aspect of my character could have changed through the course of the game. Basically in one I was playing a drunk, and thus I was pretending to drink from a hip flask through the course of the game. In the other, I was playing a character who was supposed to have, for lack of a better description, a personality disorder become more and more of an issue throughout the game. In both instances, I was somewhat expecting the GMs to come over and say something like “You’re getting quite drunk now”, or “That problem of yours is getting worse”, which I would take as my cue to start acting that up more. But in both games nothing like that happened, and so those changes never really got played - I managed to stay sober in one, and my problem was never really even hinted at to anyone in the other.
Later on I realised that the GMs had probably been expecting me to do it myself, without them telling me that now was the time to change how I was playing the character. So, my question is, as both players and GMs, do people expect players to just start acting these things out of their own volition, or is it expected that the GM will give them a cue that they should change how they’re playing the character? And which way would people prefer it to happen?
Personally to my mind it makes more sense for the GM to do it, because things like addictions and worsening personal traits aren’t really in the control of the character, thus the GM, as the representative of everything else in the world, would signal changes at what they saw as an appropriate time, but I’d like to hear what other people’s thoughts are.

I’ll remember this for the future.