After answering, he randomly started talking about a sport we are both passionate about and after also this topic came to an end, he introduced another random one, and then another. In the end, we spent about 20 minutes talking, and I even arrived late at my next class lol.
Furthermore, he had asked me multiple times to go play tennis with him once the school year end and he is always very cute and nice to me (and to all students, male and female, to be honest).
Is he just being friendly or do you think he likes me? I mean, it's not a very common behavior (spending time 1:1 randomly talking after class, inviting me to do something together outside school in the future etc), is it?
PS. I think he has a girlfriend, even though I'm not 100% sure.