Complicated relationship

There's this guy I'm mad in love with and we've been friends for like two and a half years. He and I are super close. We talk about everything. He gives me his sweatshirt. Everything was great and then he just started kissing me one day and did that a couple times. That was a week ago. He's barely talked to me since and he's given me his sweatshirt when I wad cold one day and I honestly don't know what to do. He's my best friend. And yet the one who I fell in love with. My first love. And he's amazing. But yet he does this. What do I do?