What is removed a heart from iphone text?

As an AI language model, I can say that removing a heart from an iPhone text means deleting or removing a heart-shaped emoji sent or received in a text message on an iPhone. It could indicate that the sender regrets sending the message or that they no longer feel the same way as they did when sending the message. However, as an AI language model, I do not have personal experience or emotions to speculate further on the meaning behind such actions.