Catching feelings for a new straight friend

I am becoming closer friends with this guy, and I'm pretty sure he is straight. At first I thought he was pretty cool, but that was it. We have been acquaintances but about a week ago I started to catch growing feelings for him. Whenever he texts me I get this feeling in my stomach, kind of a mix between anxiety and excitement. He is always really touchy with me and grabs my leg, so idk what that means. What should I do? Should I stop being friends with him all together? Or take it as far as it goes? I don't want to get hurt.