Why would a "player" pretend to care? (now I mean)?

If a guy whom only wanted a fling with you/casual thing, is telling you his problems and that he understands how you feel, and suggests you see a doctor because he thinks you're depressed, and he says he has seen a doctor recently due to his depression,. do you think that's weird that he would talk about these kind of things to a girl he wasn't interested in becoming serious with?

I told him I didn't think we should hang out, and we ddint talk for a while, till we had shifts at work again, and when we did he acted all over friendly/helpful towards me and would try and talk to me and ask me how I am, I don't get why he should care if hes into casual sex... I mean we havent hung out as friends in months we see each other at work and he often asks me how I am, compliments tries to touch me on my back/shoulder/ back of my neck. Or randomly starts stupid arguments/tries to contradict me.

Why is he even bothering now?