My Grandpa is calling someone else grandson, should i feel jealous?

Hi All,

I am a 24 years Grandson Who loves his Grandpa the most in this World. There's a guy whose like a neighbor and he is trying to attract and being friendly with my grandpa I don't know why but i feel jealous because before my gramp used to like me before but when nowadays when he is around i think my grandpa is liking him more.

Infact my grandpa is calling him grandson too, He meets my grandpa everyday buys things for him too which I do everyday. I always buy my grandpa medications, vegetable and even more than that. My grandpa does love me.

But nowadays when i meet my grandpa he always talks about him. My grandpa treats him as grandson. To me he is just a stranger. Since that guy came to my grandpas life my grandpa is not liking me any more. I feel bad maybe because im jealous but can someone advice me what to do?