boyfriend

So I've been going out with this guy for like 3 weeks and we have a class together( chemistry) and I like him but he's way too shy and I'm shy too. We don't have any trouble when it comes to kissing but idk what I should do in order for him to be more comfortable with me? When we see each other outside of class we always kiss( when there's no one around) But if he sees someone then he just stops. What should I do?