I like being alone. I have control over my own shit. Therefore in order to win me over your presence has to feel better than my solitude. You're not competing with another person, you're competing with my comfort zones.
This quote relates to existentialism because of the idea that we are entirely free. No one can determine where we are going but ourself. Nothing is right or wrong , everyone has a freedom of what they believe. We can all rebel and do what we want because we have the freedom too and we have to discover the meaning of our life on our own.