My dad told me once that even after the divorce, getting remarried, and that me and my siblings have moved out to live our own lives, he'd sometimes call my mom (who also had been remarried, but divorced again, and is still single today) to see how things are going. From what little I've heard of why they separated in the first place (and with how differing their sides of the stories were to the point that I couldn't keep up with it to remember), I can't even fathom why they'd still keep in touch to this day. Maybe it's because compared to how they were before the divorce, they've become totally different people to where they wouldn't be recognizable. Maybe that was what Ri-chan was struggling with in her inner conflict with the following quote.
It's Papa, but it isn't. It isn't Papa, but it is.
Putting aside the different appearance from aging, though she knows that man is her father, he's become totally unrecognizable to her. He isn't the same man who she remembered him by when growing up, to the point that she couldn't even tell him about her new boyfriend with confidence. She may not hate him, but he's pretty much lost his privileges to be part of her life as a father now, especially when he has a new family to look after now. I don't think she'll want to meet with him again after that, at least that's what this exchange said to me.