So Vincent has been looking for atonement since forever, yet he can only think that the only way to atone for his sin is to disappear
Imagine him as a kid blamed the entire tragedy of Sablier on himself, seeing people dying left and right, how traumatized he was!
Yet Ada was the 1st to forgive him (well even i don't think she's the one to forgive or to not foegive as Vince did nothing wrong on her lol) and that's what Vincent was seeking!
Ps: Just Echo!