I've become very good friend with my students. I spend most of my free time with them as they also happen to be my age (they're 20 and I'm 26).
I really like them. I think Chinese students are cute and everything they do makes me chuckle.
Have you ever really like someone who didn't like you back? It's rare.
If a student feels you like them of course they will feel the same way.
I've bought presents for my students of their birthdays and always try to make them feel better when I see them.
One simple thing which really helps: remember their names. It's so important.