Hiding Something

I have been in a situation where I was keeping something a secret from someone. My friend's birthday was coming up and I decided I would throw her a surprise party because I knew she wasn't having one this year. So I told all her friends about it and so almost everyone knew but her and so we all were talking in secret. She told me after the party was over that she thought it was something worse because we didn't include her. Good thing we didn't all get in a fight before the party because that would have been sad.

When I was keeping the secret from her I tried so hard not to act any different. She never suspected a party because we planned it for about a week after her real birthday but I think that she suspected something. She did act a little different but it was probably because she felt left out, but for the most part I don't think she noticed much.