We act like boyfriend and girlfriend just for a laugh but i'm getting serious :/?

Okay well

We both are friends ; but we act like literally act like boyfriend and girlfriend for a laugh. Like a sarcastic 'Hi baby' and all that we don't kiss or anything. We do hug sometimes not long ones, just for like one second..its was all a joke, but i don't know if i'm really starting to feel for him?

I be thinking of him for like most of the day and smiling about everything we done on the day.

But then i feel upset because i don't know if its real, however he does give me signs;

Like about 3 days ago; it was lunchtime and me and my friends went to the shops, his friends went into the next door shop but he came into the shop i was in to give me a hug and then went..if he doesn't feel anything for me either why would he go out of his way to give me a hug?

and yesterday we were just sitting in our common room and we was just like stroking/playing with my hair?

What does all this mean?

Do you think he feels anything for me at all? :/ if not i would prefer to forget about him..but how do i tell him to leave me alone? he will find it a bit weird wont he if one day i just say 'leave me alone'