Boy Next Door or Something More?

There’s this guy I’ve had a crush on for a while now, he’s sweet and charming and has been nothing but the best to me. I finally confessed to him a week or so ago, and he took it way better than I thought he would. I had no idea if he would even consider speaking to me again but he made me feel so comfortable about it and still wants to be my friend. We’ve spent nights sending each other voice messages about the most random topics, but I still have feelings for him. And every time he calls me his friend I fill up with this weird bubbly soda-like feeling. But at the same time I feel like I fall flat onto concrete. It’s tearing me at the seams for no reason, I love that he sees me as a friend and it makes me so happy, so why do I feel like crying all the time? It doesn’t make sense, I’ve woken up at dawn to make cookies and other gifts for him, so why does his attention make me so sad? I have no idea how to feel, he’s moving back to Japan soon and I feel empty? I’m not sure how to describe it, maybe like a puzzle with missing pieces. It’s a little embarrassing someone can make me feel this way so quickly.