Disappointed

This is just a new relationship that's just starting out. But he seems cool. We've only been seeing each other for about a month now. Don't get me wrong I'm not one of those people who becomes immediately attached to someone.

So it just so happened to be his birthday last night. I had suggested we go out for his birthday. Just casually nothing serious cause again we aren't together we are just starting to see each other right. He was all for it. Then thirty minutes before dinner he cancelled and said he was going to the bar with his buddies. I was a little bit sad. I guess there's no reason for me to be sad. Right? Thoughts?