Breaking up with semi-clingy boyfriend?

So I've been dating this guy for a week and were both 13. It's not a serious relationship obviously but he thinks it is. I used to like him. But now I don't. I wanna let him down easy over text message because I'm too shy in person. and Hes a horrible kisser. It makes me wanna barf. And He's too lovey. Like, lovey relationships are cute and all but I don't want a lovey relationship with him. He told me he loved me alot and I kinda avoided him all day until my friends left me alone and he came up to me. What do I do?