He is always very nice and affectionate to all students, but is this also considered being friendly or could it be considered flirting? I mean, it's not very common for a male teacher to ask a younger, female student to do something together just the two of them outside of school, is it?
But I don't know, maybe I'm reading too much into it and he just really wanted to go play tennis with someone lol.
P. s. He asked because he found out I play tennis, and he also enjoys this sport.