That joking around a lot calling each other cute? That's flirting. So is his joking about your having a crush on him. (All you have to do is say something along the lines of, "What if I do?" That's an easy one!)
Here are two articles to help clarify your situation. The first, "How to Know When You Have a Crush" will be helpful because it gives signs of crushes. You'll be able to identify if he is exhibiting any of them. You already know, of course, that you have a crush. https://pairedlife.com/dating/How-to-Know-When-You... The second article, "How to Tell Your Crush That You Like Them," solves the issue of communicating your feelings so you can take it to the next level https://hubpages.com/dating/How-to-Tell-Your-Crush... Good luck!