Is infidelity more common nowadays, or simply more accepted?

Is infidelity more common nowadays, or simply more accepted?

A question born by a little vignette I found on my feed today.

"Its my husband - he says hell come home late because hes at the pub with you!"
"It's my husband - he says he'll come home late because he's at the pub with you!"
Is infidelity more common nowadays, or simply more accepted?
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