You sit him down and explain exactly what you did here: that you really like him, you want to be with him, but that you want to slow things down a bit. Try to figure out what slowing things down will mean to you before you have the conversation. Think about what you want this relationship to look like, and talk to him about it. If he really likes you, he will respect your needs. If not, then you can call it a loss and dump him because it's soon enough in the relationship that you haven't invested much time or energy into it, and you can end it. There's no point in being with someone who can't respect your wishes, expectations, and needs. I am hoping he will respect you and your needs, but you have to talk to him about it to know for sure.
"Caring is not an advantage."