DO YOU THINNK HE WANTS ME BACK?

Not sure why your friend's parents believe you are a slut simply because you had a boyfriend. As for the boy in question, remain friends but give the relationship a rest. Any guy who wants to keep his girlfriend a secret because of this friends doesn't need to be in a relationship. It indicates he is too immature. In all likelihood, you are infatuated with the idea of being in love. At 13, you are barely out of childhood. There will be plenty of time for relationships.