Leah wasn't in love with Jacob Black.
She couldn't be, not when her heart still ached for Sam. She knew, of course, that this was stupid- Sam had Emily, his beautiful, perfect little wife. Sam wouldn't look twice at Leah, not now he had his other half- who happened to be her cousin, Leah thought bitterly.
No, she couldn't love Jacob, not when she still loved Sam. And Leah didn't think she would ever stop loving Sam. She had given so much of herself to Sam, she didn't know how to get it all back. And even if she ever did, Leah didn't think she'd have the strength to give herself completely to anyone ever again.
And yet Leah couldn't bring herself to stay away from Jacob. When she was with him, she felt… warm. Necessary.
Leah didn't love Jacob, but she wanted him. She needed him. And wasn't that enough?