I think that you need to find some kind of comfort in that when another person is struggling like your father and now this guy, that it really is not YOU that is being rejected. Instead it's about how these individuals cannot have a normal relationship where they can appreciate you the way you deserve to be loved and appreciated. It's not really YOU that these individuals are rejecting and are challenged with, it's more in themselves and their inability to engage others in a healthy way. It's something hurt in them that is more predominent in their lives, not you. It's sad because the truth is "hurt people often do hurt other people".