Suppose we take it that this is their dynamic--she 'understands' what he cannot or will not say (except for the biggie, 'I love you and can't bear you to be friendly with another male who's not a bhaiyya'), it's still creating a situation where the guy gets away with too much. Rather, it's underlining an unequal relationship. I have always felt that in most circs when Yuvraj is nice to Suhani, he's too superior, indulgent. Except during snaky-reformation and in few other instances when he treated her as an equal.
I guess it's his pride and his silence (in important matters) that will drive the divorce track.