For some reason, I can't really sympathize with them even though I usually like this kind of concept. To me, she's doing the bare minimum of a nice girlfriend and he's getting all blushy about it. I just think she's not doing anything particularly special, but he and the author make a big deal...
I think the father liked Mikhail because Juvel liked him. I also think that the father gave the sword not for suicide but for protection. She misunderstood it because of her awkward relationship with the father. That is also probably why he said to endure it for now, maybe he had a plan...