Why is my best friend (we started of as a thing..) taking a step back?

Our relationship is pretty fucked up.

I moved to a new city and he was the best friend pf my guy roomate. We became friends and not much later he told me he want us to go out on a date, he told me he wanted something serious with me. I was after a breakup and wasn't really there.. he became one of my best friends but i didn't want to risk it.. in this new city he was one of the closest and most important people i had.
There wasn't a day we haven't talked, if not meeting than facetiming like three times a day. He would always flirt and on parties try to get really close, sometimes try kissing me and i wouldn't let it happen.

But at somepoint we started having sex. And as usual i developed feelings.. and i started looking at him in a way i haven’t before..

I didn't say it but im sure he felt it.. we continued this friends with benefits thing but suddenly no more calls, no more where are you come for a cigarrete no more of anything friendly..

i did enjoyed this little addition but i missed my best friend.
i tried talking to him about it but he just said its final exames and he is under pressure.
but then they finished and still nothing..

i dont want to make a fool of myself so i stopped calling and trying to figure what happened..

so maybe can you explain this to me?

And why is it so painful😢

Why is my best friend (we started of as a thing..) taking a step back?
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