Head over heels D3rlord, he’s seen the good the bad the ugly and considers himself part of everything negative in the universe. He remembers the terrible things he’s done, how it affected the people in his life. He’s incredibly lonely and he knows it’s his fault, he’s seen all the routes he could have taken all the things he could have said to keep people close to him, to help his friends. And he morns the loss of all those relationships, and yet when Avery tries and perseveres to find him. It puts all his fears to rest, this good person is looking for him. He’s spent time, energy, and his health all in danger to meet D3r.
Avery is a good person and by extension believes D3rlord is a good person, D3r knows this because Avery sees the best in people and sees the best in him, and while D3r knows he could never live up to the idea of what Avery has in his head of him, he’s still glad that a real person wants to talk to him, wants to find him. And make sure he’s ok. Which is why he’s head over heels, he is willing to extinguish his existence so Avery could live another day, with the knowledge that Avery loves him back.