Is my teacher interested in me or just being friendly?

Anonymous
My teacher (M30something) asked me (F18) to go play tennis with him (adding "maybe it is better that we go after the end of the school year") and I agreed. A few days later he reminded me of this, so it seems like he is looking forward to it.
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.
Is my teacher interested in me or just being friendly?
2 Opinion