I think the sad truth is that most people learn this the hard way. You care too much until you feel badly betrayed by the company or get totally burned out. Then you realize one of the major causes was the emotional attachment and you need to let it go.

After 10+ years in the industry, I let myself fall the “passion at work, coworkers are your friends, etc”. I don’t know why... I guess I was a bit tired to be always cynical and let my guards down. After quitting, I then realized that I was a fool and that hurted even more.