It's said that the advertisement for the carer said 'desperate'.
Special attention is drawn to Lou's mother wearing a cross on her neck when she protests Will's euthanasia. If she's a devout Christian, she would of course be against suicide.
Will planning to kill himself despite—or even perhaps because he's fallen in love with Lou, not wanting to burden her with a crippled lover and/or fearing that she would one day resent or pity him, was actually perfectly foreshadowed in his treatment of his ex-girlfriend, who he repeatedly rebuffed despite her efforts to be there for him and assure him of her love.
