If a person is always on your mind, it could be because you have strong feelings for them, such as love, admiration, or infatuation. Your mind may be constantly preoccupied with thoughts and emotions related to this person, causing you to think about them frequently.
On the other hand, if a person is always on your mind in a negative way, it could be because they have caused you pain or hurt you in some way. Your mind may be replaying past interactions or conversations with that person as you try to make sense of what happened and process your emotions.
It's important to recognize that having someone on your mind is a normal part of the human experience, and it's okay to have strong feelings and emotions for others. However, if these thoughts and emotions are interfering with your daily life or causing you distress, it may be helpful to talk to a therapist or mental health professional who can help you work through your emotions and develop coping strategies.