What does it mean for my girlfriend to change her signature to "heart to heart, you are in my heart"?
Let me talk about my understanding. Empathy means putting yourself in the other person's shoes and thinking for the other person. You are in my heart. If it is because of you, congratulations. It means that you have entered the other person's heart. But then again, people's self-awareness is very strong now, some are just on a whim, some are just for fun, and there is no deep meaning. So, as a good start, try to get along well. I hope it helps you.