Right before they have the broken heart there should be a green picture over their head showing what it is they need, i.e. mirror, changing room. See what that picture is and add one of the necessary items and that should resolve the broken hearts for a little while. When I had to add mirrors, I just purchased a bunch and stuck them on the walls, they are cheaper and don't get in the way of racks. Just make sure you leave a space in front of them for the customers.