The Mom Was A Bitch!
She preferred him as a "polite" boy in a coma rather than a man with his own opinions and his own natural desire to date women.
And in the end she actually asked and received permission to stop the drug treatment and return him to his coma.
She knew that he was fighting his condition and quite frankly she wasn't on his side.
Contrast her to Forrest Gumps mother who always believed in her son and always encouraged him to do his best out there in the world.