No I tend to get invested in something and get into it more and more and more. Good if it's something productive, like training or pickup, bad if it's not, like depression.

Have you read Psycho Cybernetics? One of the suggestions of that book is that we are like a thermostat, whenever we deviate from our perception of ourselves we tend to allow it briefly, but then settle the temperature back down to what we perceive fits our identity. It's an inertia like effect that causes people to quit diets and myriad other things...etc. It's an interesting read.

PS