People are never perfect, so you will not always get along with the person who cares about you. Sometimes you will be frustrated, or feel ignored, or accidentally ignore them, or fight. Mistakes will be made, because hey, we’re all human. But then time passes, and if you can, you rectify the situation. Because that’s what you do with people who truly matter.
Sometimes a person who once cared for you stops caring. Maybe they wanted to end your relationship, be it romantic, platonic, or familial. Maybe you did something wrong, or distance separated you, or they changed as a person. Sometimes you bond with someone, or do something for them, or have a heart-to-heart, and they care for you once more. Caring is a fluid thing that can change over time. But there are also some people who never really cared for you, people who you know will never care for you, no matter what you do.