Rewatching the final episode and thinking about Wille assuming Simon was over him. When I first watched it, I was confused why he would assume that. But thinking again about how Wille grew up, it makes sense. In the one and only scene in which Wille's mother actually tells him she loves him just the way he is, it's immediately followed by conditions of when and how he can be who he is.
From everything we've seen, Wille has not been shown unconditional love. In the times when Wille felt he has disappointed his family, he never got assurance that they still loved him. In fact, they've left him to be alone. Love is not a separate thing that stays constant no matter the surrounding events. To Wille, they are always connected. So when the next closest person in Wille's life got hurt because of Wille / Wille's circumstances and he decided to leave, even though it's completely different situations, the loneliness that Wille felt was still the same. So Wille fell back on the only understanding of love that he had.
In S2, Simon makes it very clear that the reason he can't be with Wille is because he's hurt and doesn't feel he can trust him, but Wille still comes to the conclusion that Simon just doesn't love him anymore.
In S3, Simon ends things because of Wille's situation. And even though Wille tells Felice that he understands Simon, he ultimately defaults to what he knows. Someone in his life is hurt because of him and he's been left alone. Which means that person's love will also go away.
That's why the last thing Wille says to his parents is so important. He knows he's disappointed them again. And he knows they're not going to reassure him that they still love him. So he's going to do what they never did for him. He's pulling away from the monarchy, but not his family. His love for them is unconditional.
