She had always thought that if she could just get him to really open his eyes and look around he would finally see what everyone else saw. She loved him, she desired him, she craved for him, and she lived for him. He was the reason she got up every single day. She served her human filled pies to the people of London everyday in the hopes that he would one day notice her. Every single thing she ever did was for him, but he never noticed, never even cared to think of anyone else besides himself. The one thing she couldn't have seen was that he was selfish. She saw the good in him, the bad, the beautiful, the genius, the dark, she saw everything but the thing she refused to acknowledge.
She also didn't realize that she herself was just as selfish as he was. She lied about his wife because she wanted him for herself, she thought of the idea of putting his customers into her pies so she could make money in a more decent way then selling her body like she'd been doing. She took the lad in because she wanted a son but was incapable of having one herself. Mrs. Lovett was indeed one of the most selfish woman in London, she would do quite nicely with that barber above her shop.
All the customers noticed the sudden change, not only with Mrs. Lovett's shop, but with the woman herself. She was happier and her pies got better as soon as the mystery barber had appeared. They all figured something was going on between the two. The people's rumors fueled her hope that he would come to his senses and see that she was waiting for him. The customer's weren't blind and noticed immediately that if there was a relationship between the two it wasn't one of the most desirable kind. He hardly looked at her and she practically threw herself at his feet.
The boy, Toby, noticed things that others did not. He of course noticed the looks his mum would give the demon barber. He didn't approve of them being together like he suspected they were. He noticed much more than his mum suspected he did. He noticed the men that would leave her room at obscene hours of the night before she had enough money to stop, he noticed the men that wouldn't come back from their shave and he also noticed the anger radiating from the barber. But he never noticed his mum's skirts with droplets of blood splattered on them from the men that never left Sweeney's shop alive.
He noticed all. She may have thought him blind to her blatant advances, but she was gravely mistaken. He noticed the way she looked at him, how she tied her corset tighter when she knew he was watching, the look in her eyes as she stared at him thinking his mind was wandering. Oh yes' he noticed every single thing she did to get his attention, but he also noticed the things she did behind his back when she thought him out or sleeping.