You may be over reacting just a little. He may have not been staring at you because you were in a towel-he was probably antisapating your answering the door. I watch people walk towards me if I'm expecting them to open a door for me.
He may have been looking for his nephew-your boyfriend- to appear, too.
((((((((((((Inny))))))))))))))
It's okay-you were probably triggered by a memory. I don't think your boyfriend's uncle will hurt you. ((((((((((You're safe)))))))))))))