Im 17 and hes 28 im on work experience What does this mean this all happened yesterday?

Im 17 an I do work experience at a gym with a personal trainer hes 28 & married with two kids. After work he said i'll walk you to the train station but it was daytime and the station was 2-5minutes away, he showed me pictures of his kids why did he walk with me and it was daytime?
2.) he told me personal things about his career and that he was depressed and that he should be my first client if I'm going to be a sports psychologist
3.) he female collegue teased him about me he said its strickly professional with sort of a smile why?