Is Gongenzaka saying that because he believes in Yuya, or can't bear to lose him? He hesistates before drawing back a little, so he can look him in the eyes properly.

"We all have to," he says with weak determination. "But... we also have to get out quickly, don't we?"

Otherwise, Yuya knows their chances slip further and further away. There's a level Yuya will never pass, but he can't hold Gongenzaka back either. To stay forever means to pull them further and further apart... no matter which direction they go. He doesn't want to let that happen.