The personal/professional “bleedthrough” on Blue Bloods was simultaneously one of the most captivating things about the show as well as one of the most aggravating.
The Jamie/Eddie dynamic was over-the-top obnoxious and not typical of what people encounter in real life. So I don’t think an example from that show does justice to the OP’s provocative and worthy-of-discussion thread title.
I’m not someone who is committed to no-holds-barred 100% truthfulness and transparency in any one situation in life and definitely not in a relationship. I am committed to honesty, but I also don’t feel that telling your partner every single thing from your past and every thought in your head is a good idea. Every question does not have to be answered. Before either of you asks a serious question or answers one, you have to think ahead to whether one or both of you can live with the change between you that the answer might bring about. Maybe you can. Maybe it will bring you closer and make you stronger as a couple. But maybe not. People have a right to keep some things to themselves. Forever.
I’m thinking of an episode of M*A*S*H* where BJ has a one-night dalliance with one of the nurses and he immediately wants to sit down and write a letter to his wife Peg back home and confess to make himself feel better. Hawkeye talks him out of it. BJ’s penance is to live with this secret and not seek absolution at the cost of his wife’s broken heart. Maybe he will confess sometime in the future after he is back home. Or maybe not.
That’s why they call it being grown up.