how is that a draw?

Hi every one. I'm kinda new to chess in general, and i just wonder why was my game declared a draw in this case?  
I still had plenty of time, i was methodically walking his king to a corner to mate him, when all of a sudden : DRAW. 
So i m kinda sad but mostly i want to understand, what happened there? 
thanks in advance <3 

Stalemate. Black is not in check and has no legal moves, so that is a draw by Stalemate.

https://support.chess.com/article/682-what-is-stalemate

Qd7 would have been mate

The black king is safe but can't move, so your opponent can't do any legal move and that make a draw. This happens often in end-game where you're clearly going to win, and if you want to win this kind of position you always need to take care of this

I'm too late

You missed 67.Qd7 mate.

Oh wow, okay. Thanks every one

A sad case of stalemate. Would recommend pre-emptively looking at the en passant rule as well.

It's a pity that the rules are designed that way.

There is no lenient rule for newbies. You have learned it the hard way, and always remember - you must ensure that the opposing king has room to move about so as to minimise the risk of landing a stalemate.