But Pip was the one who invited the feckless, jobless loser to move in with her Francis! The suggestion seemed to come as a bit of a pleasant surprise to him if I remember correctly and only came about after an argument with David? Jill? when the relationship was uncovered.
Toby flies by the seat of his pants. I don't think there are strong feelings on either side to be honest. Pip's keeping him at Rickyard to make a point to her extended disapproving family; he's hanging around for the free bed and board. She's backed herself into a corner. If she was prepared to swallow her pride and endure the chorus of "I told you so's" she'd be able to get rid of him fairly quickly. He's got no hold over her.