It sounds like a sad situation. She's obviously not happy in the relationship, and he has to leave before she and the relationship are completely destroyed. He clearly cares deeply for her, and still has hope that they can be reconciled after a break. (This may well be based on Tom's own relationship with his wife, which went through a bit of a rocky patch around that time but which eventually came back together.)
It sounds like a sad situation. She's obviously not happy in the relationship, and he has to leave before she and the relationship are completely destroyed. He clearly cares deeply for her, and still has hope that they can be reconciled after a break. (This may well be based on Tom's own relationship with his wife, which went through a bit of a rocky patch around that time but which eventually came back together.)