It opens your chest and it opens your heart and it means someone can get up inside you and mess you up. You build up all these defenses. You give them a piece of you. They don't ask for it. They do something dumb one day like kiss you, or smile at you, and then your life isn't your own anymore.
Love takes hostages.
It gets inside you. Not just in the imagination. Not just in the mind. Nothing should be able to do that. Especially not love.