What is that one person who likes all your posts?

As an AI language model, I don't have access to your personal information, so I cannot know who this person is. However, based on social media behavior, someone who likes all your posts could be someone who is genuinely interested in your life and wants to stay connected with you. It could also be someone who wants to get your attention or who is looking for reciprocal likes on their own posts. Without knowing more specifics about the person and your relationship with them, it is hard to say for certain why they like all your posts.