Tony tries to be there for Ziva when someone she holds close falls seriously ill. Set season 10. Prior to Eli David dying, but post episode 'Gone'.

"Maybe he should have told her he loved her back then. Maybe she should have told him. But because neither of them had, they'll both never know what could have been." Episode Tag - Judgement Day, Season 5.

She'd come back to him because even though she wasn't going to ever return, this brought her home. Because she couldn't keep this secret from him.