I always prefer socializing with a stranger over someone that I thought I know.
The unknown have infinite possibilities. And if anything, I can just leave, knowing that I may never see this person again. There’s a mild amount of anticipation in getting to know a stranger, that force me to be alert at the present and making strategies. Where the chances of winning his favor is a question mark and with enough confidence I just might make it.
With the knowledge of a character I tend to make assumptions and then behave accordingly. And with each encounter I will analyze his actions, his words, his being, and then estimate my value to him. So eager to please, so sensitive to irregularities. That is, if I think he is worthy of my affection at all.