What does it mean If a guy takes a picture with his arms around you and he clinches his fists, is that a sign they are just friends?

dpeguero
My ex took graduation pictures with this one guy and in every photo he has his hands clinched when putting his hands over her shoulder. I assume that couples or people who are physically comfortable would wrap their hands around you with their palms.

What does it say?
What does it mean If a guy takes a picture with his arms around you and he clinches his fists, is that a sign they are just friends?
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