Seeing heart shapes everywhere when you have someone on your mind is likely a result of a psychological phenomenon known as "pareidolia." Pareidolia is the tendency of the human brain to perceive familiar patterns, such as faces or shapes, in random or ambiguous stimuli. In this case, because you have someone on your mind and likely have strong feelings for them, your brain might be more attuned to interpreting random shapes or patterns as hearts, which are commonly associated with love and affection.
When you have strong emotions or thoughts about someone, your brain's cognitive processes may become more focused on finding connections or symbols related to that person. As a result, you may start noticing heart shapes in everyday objects or surroundings, even if they were not intended to represent hearts.
This phenomenon is quite common and not exclusive to hearts. People often report seeing patterns or shapes that have personal significance to them when they are emotionally invested in something or someone.
Keep in mind that while this might be an interesting psychological phenomenon, it's essential to maintain a balanced perspective on your feelings and the situation. Seeing heart shapes everywhere does not necessarily predict the outcome of your relationship or the other person's feelings. It's just a quirk of human perception and emotion.