Why do a lot of women not include their s/o in their pics online or as a background pic on their phone?

Slim57
Like for instance on Facebook a girl is in a relationship, but she's got selfies up while her boyfriend has a picture of them together, or a couple where the man has his s/o as his background but the woman has something else like her dog or something
I know why
I don't know why
I do this
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Why do a lot of women not include their s/o in their pics online or as a background pic on their phone?
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