I think the sentence should be...
"His mother thinks THE WORLD of him and has done everything..."
In English, if you say "I think the world of him" you are saying you think he is wonderful and he can't do anything wrong. It is a very exaggerated admiration for someone. Perhaps the mother thinks that no woman can be good enough for her amazing son. He's just so perfect !!! So she tries to break up his relationships so she doesn't have to share him with anyone.