Why is more affectionate in public than in private?

He’ll touch me more in public than in private like hugging, putting his hand on my low back, touching my hands, hugging me from behind, putting his head and nose into my neck

But when it’s just us two, he hardly does stuff like this, but he’ll open up more, like we’ll talk serious stuff but not as much touching
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When it’s just us he’ll do little acts of service that shows that he cares like bringing me food (w/o me asking) or asking me about my day, or we talk about our goals/aspirations/family life, stuff like that
Why is more affectionate in public than in private?
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