Never bring a person to the state of "I don't care". If you really care about someone, don't let them cross the line that leads to a zone of complete indifference towards you. There is no return from there, but it is quite easy to bring them to it. It is enough to hurt them regularly and spit in their heart. If you really love them, don't treat them as if you are not afraid of losing them at all. Don't think that absolutely everything can be returned. The strongest and most solid bridges burn the brightest. The one who forgave the longest leaves once and for all.