What does it mean when a guy claims he's growing on me?

When a guy asks you to check out bands/shows/movies he likes what does this mean?



It's a guy I met in school who mesages me every month or so and talks to me about the following above ^^^. When I go to talk about them with him, he replied with

"Im growing on you :)))) ) Is this a weird way of flirting or what?

What does it mean when a guy claims he's growing on me?
Post Opinion