What do I do if my guy friend likes me?

So, I weightlift at my school in a weightlifting class. Because of this, I have a lot of guy friends who are basically just my bros. I'm really close to one of them, Nick, and we talk everyday at school, and text most days. We have a chill relationship, and often help each other out with relationships, but lately he's been acting really weird. I broke up with a short-term boyfriend, and Nick's behavior changed entirely. He keeps talking about how I've never been kissed, and how "we need to fix that". He's asked about my feelings on fwb relationships. He's called me cute or attractive multiple times now. He's cute, but I don't think I want to date him. How do I keep this from getting weird(er)?