"No."

It's an answer to both questions, really. Shouldn't he be happy? He got his old body back, his emotions feel like they're there. Chara and Frisk are here, his parents, it's everything he could want.

The previous two incarnations of him weren't happy, why would it be different for him? Because Chara's right, time stopped moving for them a long time ago.

"No, it's not. I... haha, I should be happy, shouldn't I? I have everything I could ever want here.

But I can't have any of this. When all of this ends, when I go back - it's just going to be me in the Ruins, and it's going to be me turning back into Flowey. And all of this will be gone. That's... the ending I'm always going to have. No amount of Determination in the world is going to change that.

When I first found out how long everyone else here had been, how they've been living their lives, I was really jealous. Because everyone had already moved on."

Jealousy was an ugly emotion, and not one that Asriel wanted to admit to. He was happy, in the moment the barrier broke. He was happen he managed to do one thing right, and let everyone go so they could finally live their lives.

He just didn't imagine it'd be so painful to see them happily living their lives without either of them in it.

"I'm scared of this place, Chara. I don't want to get attached... it's not where I belong."