I'm not so sure, they just do, in the end, because she and Arthur Gewn not happen because she did not feel well enough, but you can tell she loves him, and Arthur also believe it could happen, he loved her, As he said theres no other hope. She did just that Gwen pushed him out to save the heartache of the two of them the right thing. I agree with the last point is because they want to push him away form Minge temperature, because she thinks the world is no other chance. But it also just looks like the idea of writers, the bed for some time.