Ok I get that her trope is like the dumb, innocent and immature girl, but for christ's sake she's an adult but she's lacking too much common sense. For example, she didn't learn her lesson with what happened with Hikaru where she basically hurt Fujima cause her mental capacity doesn't exceed that of a 3 year old who doesn't know what's right from wrong, but I'll let it slide since at that time they weren't official.
However she's doing it again with the new actor character. He obviously stated that he was interested in her but she lacks so much common sense to the point that she doesn't clarify that she's dating someone, she doesn't even remotely bring him up whenever she meets the actor. They're basically going out on dates at this point and I just feel bad for Fujima cause this is borderline cheating. She doesn't even give him a heads up like "Hey I'm with my guy friend at XXX on XXX time", like girl?! Is it so hard to update him then wtf is your phone for???.
As for fujima although he doesn't communicate his thoughts as much, at least he's very considerate of her to the point where even if he gets jealous and angry he just brushes it off using her "innocence" as an excuse. For instance who would willingly go to a shady abandoned looking mansion with a girl you've only met today, only Rio.
Moreover, Rio doesn't know how and when to set boundaries and always ends up hurting Fujima, meanwhile he sets clear boundaries between his relationships with people, he turns down girls who are interested in him/who he's been with before and makes sure not to make Rio feel unwanted or insecure. He must've had the patience of a saint.
At this point although I don't agree with the grandmother regarding getting pregnant. I do agree that Rio doesn't deserve Fujima. Hell, it's so obvious how she's oblivious to the world seeing as how she readily agreed to get pregnant by a guy she's only been dating for a few month. Like girl where is the self respect??? She needs to fix herself first and get her priorities straight before diving into a relationship with a person like Fujima. HELL EVEN FUJIMA THINKS IT'S TOO SOON.