Neutral
no hope and no fear for expectations are the root of all misery
Sebastian Marshall quoted a Buddhist quote in his take on strategy and I also really like this quote. I have roughly followed this concept and the idea is regarding any possible future outcome that is out of your control, you should have no preference to which way the dice rolls.
Obviously this is different in situations where you actively try to achieve something (Because you really want it to happen) and because you tried you made it more likely to occur. But when something is no longer in your hands, such as whether a pretty girl likes you or not, or whether you win the lottery or not, the stance you should take is not being affected either way, you should not be sad nor happy as a result of either outcome.
This I guess stems from the Buddhist noble truth (Not that I know much about Buddhism) about the origin of suffering, which relates to avoiding material desires (To make it more confusing, the desire to have nothing is still a desire).
But the reason to do all this is exactly as the Buddhists say, to eliminate desire is to eliminate suffering.