If he doesn't like me, why does he always compliment me?

I work with this attractive guy and I have a huge crush on him. I know that he doesn't like me but his behaviors puzzle so me. Whenever he sees me he would smile at me, ask me how is my day, do things for me and help me out as much as he can. If he sees me dress nice he would tell I'm cute and adorable. he walks by me he would say hmm you smell so nice. I know he doesn't like me but why say all this to me?