What does it mean for boys to use girls' photos as wallpaper?

If this girl is someone he knows in his daily life, use her photo as wallpaper. Explain that this boy should like this girl in his heart and hope to see her every day.

This kind of behavior is usually between lovers. So this boy may have a crush on this girl. See if boys will take the initiative to contact girls if they usually get along. If two people communicate happily, then their relationship is still very good.

If a boy doesn't know this girl, he may just think that this girl is beautiful or his ideal type, so he wants to use her as wallpaper to make himself feel more comfortable every day.