How can you really tell if an ex is genuinely happy with their new partner or faking it?

I'm curious because I was reading a lot of Reddit posts and some guys would say that even if they are in relationships they would never stop loving their first true love etc. so how can you tell when a guy has really moved on from an ex vs when they act like they are happy but in reality they are broken inside. Why do some guys settle with someone even when they hearts belong to someone else. Can someone explain to me please.
How can you really tell if an ex is genuinely happy with their new partner or faking it?
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