Think about it
Take more time to figure out what's up with your guy friend—it's unclear whether he wants to stay just friends or if he wants more. If you're not ready to have an honest discussion about your relationship potential, flirt with him and see how he responds. Go out of your way to spend extra time with him and let him know you want him around—if he has feelings for you, it will make him more comfortable showing them. If he seems reluctant or turns down your attempts to get closer, you know you're meant to be friends.