How do you be just friends with a guy?

le

I have this guy friend and he's super kind, and really fun to hangout with. We talk like everyday and we've hung out together both with mutual friends and by ourselves. However, I'm starting to get he feeling he wants something more. I don't want to stop talking to him because I really enjoy our friendship and talking to him, but I feel like I'm hurting him by talking to him all the time and not stating my intentions. He recently invited me to a movie and it sounds like a date and i don't know what to tell him. So here are my questions

1. How do you tell a guy that you only want to be friends?

2. Is it inappropriate for a guy and a girl who are friends to hangout alone or go to a movie alone?

3. Is it inappropriate for a guy and a girl who are friends to text or talk to each other all day every day?