Both replies are amazing.
Addicts don't need a reason, we need opportunity. Like an alcoholic, gambler, etc.
Indeed it is the dopamine - just the rush and sensation which comes from it, but it is a falsehood to reality.
You mention boredom, temptation and another point which correlates wit this: The Complete Guide on Breaking Your Gaming Disorder
That is the emotional side of things. When I have a fight with my girl, the pain of the emotions which stir up inside make me want to escape, hence relapse.
I am slowly, ever so slowly, learning how to confront those emotions and reducing relapse.