I gotta admit, I'm super surprised that anyone thinks it was Nick's idea to bring in Hannah to convince June to give up the handmaids so she'd live.
Like... they're very, very clear that this idea was Lawrence's. It feels so very obvious based on the sequencing of events: Nick gets Lawrence to help save June -> Lawrence sees where June's head is at -> Lawrence (already knowing what it would take to get June to cooperate) used his tremendous influence to bring in Hannah to get June to give up the safehouse and stay alive.
He's the one who is able to have June removed from the torture cell for a brief reprieve dinner where Hannah is brought up. He's the one who tells June how Gilead really works; that they do not care about children, just power. And he's the one who ensures June sees Hannah, knowing Hannah's state of mind and how that would make June act rationally.
Nick apologises to June because he couldn't save her from suffering and that he brought in Lawrence who was able to accomplish what needed to be done to keep June alive. He feels guilt that he couldn't stop bad things from happening; that he couldn't save her.
Nick is a father too. He knows how badly it would hurt to have his child used as a tool of manipulation and how it hurts the child. I don't think he'd ever even think of doing such a thing. Lawrence on the other hand... he's pretty ruthless. He knows from his time with June that Hannah is a weak spot and so he's not against using that if it means June is kept alive.
And June knows this too. She knows he didn't bring Hannah in. She knows and understands Nick. She understands what Gilead is like, the choices it forces you to make, and that she wouldn't be alive without him. And she loves and forgives him for not being able to prevent her from harm and for going to Lawrence who brought in Hannah. They love each other and understand each other and it's beautiful.
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