Is it normal to feel like i'm going to be the rebound? comment please

Hold tight, this may get confusing.
So I have two best friends, one male (let's call him Chad) and the other is female (we'll call her Nicky).
*Chad is a funny guy, but he can be a dick at times and a lot of people think he may be a homosexual, because he does say and do things that are very risky to just call 'playing around'.
*Nicky and I are pratically one and the same, she's just a bit quieter and prettier in my honest opinion.

~So let's start with the story~

I like Chad a lot, and have for a while, but he's also like a brother to me. Two weeks ago, I told him how I felt even though he openly admitted (to her at that) to liking Nicky the week prior.
(He told me I was more like a sister to him, and he couldn't feel the same way.)

Last week, Chad got mad at Nicky and I for something I did, and he apologized for being mad. I apologized to him as well, and him and I on good terms. Nicky and him...well, that's a completely different story. Nicky won't bother talking about what happened, and if he's mentioned she changes the subject.

So now Chad and I are texting and talking like we normally would, but on Monday he told me through text something along the lines of "You two text a lot alike" and I got to thinking...

Maybe it's just me, but I feel like I might be his rebound or that it'll eventually come to that. What do you think? Am I crazy to think this? Am I getting ahead of myself? Should I really bother considering this?

*Please don't think I'm a terrible person if you caught it. I did tell Chad how I felt even after he admitted to liking Nicky, but I told him it was nothing, and I just wanted to get it off my chest, that I wasn't trying to mess anything up, and I didn't expect him to feel the same for me.