Recurring Theme on Glow..

Ok so I've been noticing something on Glow and in movies and basically every story I ever heard in real life about what happens when a girl is pregnant.. and it seems, as messed up as it seems to be, that when a girl is pregnant, the guy ALWAYS cheats.. I've yet to find an exception to the rule, and I think that's fucked up. I don't have kids cuz I dont wanna deal with that shit, id probably rather get a sperm donor and just be single and fat with my baby rather than being tortured in too many ways at once. Can anyone prove me wrong on here? Is it even worth it to "reach for the stars" in this pregnancy endeavor or is it just not possible for a guy to stay faithful while the woman he loves is pregnant with his child..?