My heart
is it's own creature, I do not control it. Like a baby critter I can only feed it and guide it, interpret it's signs, and try my best to give it what it needs to heal.
When it likes someone I must try to learn about that person, see if they are safe, see if they are compatible with me on the different levels (like parents worry about the people their kids are dating), do their natal chart, do and elections chart for the time we met, watch the planets as our relationship develops, ensure communication happens about complex topics. The heart is all "want" "need" "yay" "owww" "scared!", so I have to do the heavy lifting of everything else required for a successful and healthy adult relationship.
It's strange, it feels like my heart is a different being that lives inside of me that I have to manage, like a child or pet. The parts of self from psychology come to mind in this. Not sure, still exploring.