My friend is acting like a stalker?

hey all. i’ve gotten myself into a really huge mess. a few months ago i bought some weed and i smoked some of it directly afterwards but then i realized what a severe mistake i had made after i got caught and had to pay the repercussions so i just stashed the what i had left in the deepest darkest part of my house. some months later i told one of my closest friends that i had it and after that he has just been bothering me to get to it. it started off with just some curiosity such as questions like how much i have, how old is it etc. he just became more and more excited about it afterwards and then in the end he convinced me to give it up to him. he even agreed to pay me for it. but i thought about it later on and i concluded that if there is one thing worse than doing drugs its dealing in them so i have just been making excuses about giving it up to him. now he is waiting in front of my house like everyday after christmas and he is hell bent on getting it from me. and worst of all my parents are suspicious about what exactly he wants. what should i do? p.s. i cant own up to having the weed as i already got caught once [the first time] and well second time no one is going to be forgiving…