He sounds frustrated.

Like ElsaMars said, it might not be you; it might be something going on in his life. Like, maybe he's drowning in his own personal issues and therefore can't handle yours as well. It's too much of a burden. That could be why he cut you off.

And if you prodded him to talk while he was ignoring you, that could be why he snapped at you. Maybe he stopped talking to you because he needed his own space and time to himself. That's just one possibility. Or, if he was the one who approached you, maybe something tipped the scale on his end and he wants people to know that he doesn't want to deal with anyone's sh#t. (i.e., it's nothing personal.) In a way, it could be a cry for help.

But, not to be negative, sometimes we're not innocent ourselves. Sometimes we take things for granted and get carried away.

If you can't think of anything you did wrong, then you probably didn't do anything wrong.

I say give it some time. Let him have his space and maybe he'll come around. He's pretty irritated/overwhelmed right now and needs time to cool off. Good friends sometimes fight, but they usually ultimately get over it after some time.