Depending on the state of the sensor that connects certain neurons I couldn’t possibly tell you about, you establish a state of euphoria, turbulence, peace or neutrality. An abstract sense of happiness gives us comfort. Constant unhappiness is a state in which our sensors don't seem to be able to establish concrete connections and you go down. Your physical body is left without the willpower to activate any muscle and you become inactive. Taking it to the extreme it’s called depression.
Being this a subject which I find very close to home, an unpleasant friend that comes and goes as it wishes to. It’s an ambiguous relationship, not a toxic one. The reason it’s not toxic is that you never know what you’ll get. Whether it comes in the least appropriate moments or because it feels like appearing without previous notice, we welcome it. We give it all our energy, happiness and feeling of contentment. We become unavailable to face the world with big eyes.
I lose myself in this being, in a constant battle for metaphysical control. Me, thinking being and not a fighter, allow myself to fight a fragile mind when ambiguous friendships come along. It would be easier to send them away if we would see their presence as a bigger issue.