Should I ask him if he's mad at me?

Well...give him just a bit more time and ask after 4-5 days how he is doing. Don't mention him not replying. And if he doesn't reply, well..forget him, waste of time. He could be feeling down or tied up with other work, but if the ignoring persists, it's that...sorry for phrasing it this way, he has lost interest. It may have been nothing you did, but just HIM. I am not a guy to analyze, and confused with their mindset but that's the jist!

I was in this situation too in December. To this day I have no idea what went wrong! We were supposed to have a date soon. Then suddenly he stops replying to my texts and calls. And boy! Didn't I feel MAD! Dumped for no reason I could figure out! But, the fact is, we have to move on! Him deciding to be not-man-enough is not MY problem!

Well can you think of anything that you might of said that might of offended him? but maybe he's just been busy or maybe something happend to him or he's in a bad mood the possibilties are endless don't just asume that it was your fault

If this guy really does want to go out with you then he will make the 1st move on you.