I know what you meannnnn. It’s not that the relationship is bad for her father, it just doesn’t feel fully built up yet. Some moments feel a little forced, which makes it harder to feel invested in the story and same i would love to see more focus on Leo journey, her growth, and possibly her love life before the story goes deeper into her dads romance life
Sorry if its long
Don't worry I felt the same as you when I first found out about Varia/Phelio's relationship, but a little spoiler....
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Varia becomes exactly like Leo, she becomes obsessed with muscles just like Leo, and when they have their first child, the child too becomes obsessed with muscles. All making Phelio's life so much funnier/harder for him.

Am i the only one that lowkey doesn’t want the dad to be in a relationship? Like Varia is so pretty n all but idk it was like a weird interaction from both of them it felt like a forced romance