Am I right to be mad at him for cancelling?

I've been seeing this guy for about a month, it's early days so obviously it's not serious but we had arranged to meet up this weekend just gone. We had nothing as such planned but in his own words he said he would meet me on Sunday "for definite". So Sunday came and I had no word from him. We were supposed to be meeting in the evening and it came to 4 o'clock so I decided to text him and ask him if he wanted to meet up and he said he was too hungover from the night before and would I mind if we left it. I didn't reply because I was too annoyed that 1. He didn't even bother to text me and 2. I think being hungover is a lame excuse anyway. It seems to me that maybe he's just not that interested and just can't tell me so he's making stupid excuses.

I'm wondering what I should do now. I haven't replied to him so he probably knows I'm annoyed. Should I wait to see if he contacts me or should I just write the whole thing off because he's not interested!

Thanks!