What should you do if someone follows you home?

I was followed home a few weeks ago and he asked me all these weird questions. Thats behind now and the situation died down.

Me and my retard self called him because he gave me his number, so i called, we strightened things out. BUt the thing is my dad takes me home everyday now and he doesnt know i called the dude back and now im scared that the guy will follow me home agin and my dad will see him and the guy will rat me out because I really dont want to tell my parents.

I have no idea what to do and im cluless and a teenager that needs SERIOUS help.(As of being a reatard).