A person who doesn’t love himself cannot understand it when you love him a lot but when you say why you hate him or he doesn’t deserve you, he will think that you kept it real with him, because only the second part feels real to him as it matched his own inner identity. He will chase others who won’t truly care for him at all, respect would be a far off thing to be given to him, because it will feed his ego; the ego that will create intensity in him and he would feel that the intensity was love.
A person who loves and respects himself will accept only those people in his life who respect him upto the same level, although love won’t be involved, because he doesn’t know how and why somebody won’t respect him as he has earned respect for himself by doing right/good deeds in life, and if he won’t get it from others, he will remove those people from his life.
The former will be happy in receiving crumbs due to lack of self love, and will think that love is about giving crumbs only whereas the latter will love completely in every sense because he has known love in that sense due to loving himself completely. YOU LOVE THE WAY YOU THINK WHAT LOVE IS.