Hello 'inlovewithsensei' & welcome
You say that you are in school, so I'm guessing that you are quite young ~ a teenager perhaps?
This makes you the age that nature intended you to look at males, with a view to them being a good mate and father. Of course, you probably aren't ready for this, yet, but it's still what nature intended.
You have met an intelligent, attractive and interesting man. Being your art teacher, he is also in a position of power; yet, since he is not a school teacher, your relationship is a little different from usual relationships with teachers.
And so you fall in love!
Under usual circumstances, this would probably just be a traditional crush, but with him, it's different, because he isn't at school and you catch the bus with him.
You mention another woman. Do you actually know that he has a girlfriend / partner?
You say that you get on well with him ~ that's not surprising if you have similar interests.
You say that he shows affection ~ but, again, there is no reason why he shouldn't like you. He may even feel flattered by your attention.
The thing is, though, that it is not good for teachers to have relationships with students.
I don't know your circumstancers and a lot depends on your age and on his intentions and on whether there are others involved.
If you were 21 and he were 30, and unattached, then I would see no problem.
If you were 17 and he were 26, then I think that it would be inappropriate, and he could get into trouble and lose his job,
If you were 15 and he were 24, then it's a definite 'no'.
And yes, lots of us have had crushes on teachers and bosses etc, when we were young. Sometimes they are so intense that they do not feel like crushes, but they are.
And I knew girls who have married their teachers, but not until they were older.
Unless you are both of an age where this would cause no problems, I would advise you to enjoy your crush, but certainly not to pursue it.
