Idk what to do....

I met my best friends cousin a months ago,his names Dylan, and we really hit it off. We talked, laughed and did what normal friends do basically. After we met my best friend started joking around how cute we were and all that. I saw him again on Sunday and I feel like we got closer and we spent a lot of time together without my best friend and I got emotionally confused when I got back home because I feel like I have feelings for him but I also feel like it’s way to soon. And even if I do, I don’t know if I should tell my friend or not. My feelings about him are just everywhere