Is this normal on dating apps in Japan

So I started using Bumble last week and a woman matched with me earlier today. We have a lil conversation then I get her instagram. On her page I see the same guy throughout her posts and highlights. And I can’t tell if it’s a relative, a boy best friend, he’s gay or they’re together. But I have a feeling that they’re together. So I’m wondering if it’s normal for Japanese women to be on Bumble or dating apps even though they’re in a relationship, because I heard the cheating culture in Japan is different.

by SSJ-_-shinobi