take someone or something for granted
to expect someone or something to be always available to serve in some way without thanks or recognition; to value someone or something too lightly.
I wish you didn't take me for granted. I guess that I take a lot of things for granted.

take somebody for granted
to not show that you are grateful to someone for helping you or that you are happy they are with you, often because they have helped you or been with you so often.
One of the problems with relationships is that after a while you begin to take each other for granted.

take something for granted
to expect something to be available all the time and forget that you are lucky to have it.
We take so many things for granted in this country - like having hot water whenever we need it.