What are signs of an introvert liking you?

While listening to you, they don't blink much and they are extremely concentrated on your words, so be careful.
While talking, they hardly ever look at you, they keep wandering with their eyes or keep staring at one fixed point.
Although they don't really stare you right in the eye, the eye contact is definitely there, especially when you are talking.
They seem nervous and excited at the same time.
They smirk a lot, bite their lips, adjust their hair, move their fingers, etc.
On the outside they may seem unsettled, but they do feel comfortable talking with you. They put their sentences together very carefully. They are not afraid of silence and occasional stares.
You’ll soon begin to notice that they agree to do things out of their character just to spend more time with you and earn your friendship.
They seem genuinely interested in you. They want to know your opinion on controversial topics.
They talk extraordinarily long with you. Your conversations are also deeper and more intense than those with most of the people you know.
You can tell they trust you and appreciate you.
They are sensitive, so make sure you stick to your words and never, ever lie to them. If you ever let them down, remember that they are good at collecting bad memories.