[he's reluctant to go into detail about it, but she deserves an answer. Especially with how vehemently he's denied it all this time.]

...Because I used to want to be a king- I used to think it was my destiny. I need to find that sense of self again, that... that strength. I need to remember what it meant to be Luke fon Fabre.

[Because it's still who he is, even if he can't reclaim the name anymore- even if Eldrant was the only time he could ever call himself that again. Without the name, all he can do is try and take back the feeling it used to convey, the pride he always held close to his heart.]