It just means that maybe you look like an ex girlfriend, or boyfriend. Most of the time it's a compliment.
"Sais-tu faire" means "do you know how to do" in French. It is a question asking whether someone has the ability to perform a certain task or skill.
to know je sais tu sais i know you know
Je sais means 'I know'.
"Je sais que" means "I know that" in French.
No sais means know
"Je sais" means "I know" in English.
"You do not know" = "Tu ne sais pas" "I do not know" = "Je ne sais pas"
Je sais
You can say "Je sais tout" in French, which translates to "I know everything."
Je sais que vous le savez.
"Tu sais pas" means "You do not know" in English.
"tu sais Maman" means "Mum, you know"