He never smiles in pictures, I’m wondering if his not happy anymore?

He is 20 so still pretty young and it’s a very first relationship for both. Surely if you are on holiday or doing something fun with your girlfriend you would smile for pictures with your partner? He has a lovely smile with pictures of a street dog found on holiday or he posts lovely smiling pictures with his mates or friends take nice pictures of him smiling with friends. He also has stopped posting any couple pictures since 2020. Is it because his are unhappy and doesn't want to smile? The body language I see in the pictures just seems very off as well like he doesn’t seem to have his arm round my waist or anything he looks very stiff? He has cheated with another girl in the past and does follow a lot of half naked girls on social media, I noticed even while on holiday his followers went up and was just all half naked girls like that’s disrespectful no? Perhaps his after sex with different women?

He never smiles in pictures, I’m wondering if his not happy anymore?
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