Are men really like that?

So I was having a discussion with my boyfriend of how I think my dad is cheating, (now hear me out) not physically but flirting with other girls like texting and such. From what I heard from my step mom, is that he has cheated on her not physically but flirting and texting another woman, and I think he’s doing it again....any-who to get to my point, from what I’ve seen and heard, that it’s been so Normalized that men flirt and text girls and seem to get away with it as in the woman let’s it all go. I personally don’t think like that. If my boyfriend texts another girl and flirts, I see it as the same way as physically cheating, but I just can’t see how the spouse lets it all go.