I've hurt him and it's all my fault.

Here it gose I have been going to dinner with a guy called Adam for ages. I knew now for a couple of mouths that he has feelings for me we had just haven't got together yet. But on Friday we had my works x mas doo but he didn't come so anyway it was all going well until I ended up kissing some guy and now Adam is upset with me and we are not talking.

What should I do?

I didn't really notice how much I liked him until this happened now I feel like a