Many people take others for granted as what people value most is not always obvious to them. They make take you for granted but if you decide what is important to you and want to be there for them, their perspective does not matter, only yours; unconditional caring and/or love. As long as you have made a decision, then you are not being taken advantage of without your permission and to your detriment. If it begins to impact you negatively or harms you, then it is time to change your mind and not let them take advantage; granted or not.