they were never going to have a happy ending. it was a fact both of them had to live with. even he, the biggest optimist she had ever met, knew that. it was the one thing he wasn't optimistic about because he knew the odds were never in their favour.
despite all that, they still held onto each other like earth holds onto the sun. they preferred their little illusions to the real world, they preferred to believe they weren't going to end like that.
he'd hold her hand and play with her hair, thinking how he was thankful for the time they got. it wasn't much and it was nowhere nearly enough, but they got something and he was trying to find something positive about that.
she didn't know he wasn't truly an optimistic person. he was sad and devastated because he was never going to grow old with her, but he didn't want her to know. he didn't want her to know the truth because he was afraid the darkness that had fallen upon everyone around them would cover them, too, and there would be nothing left. not even a petal of his beautiful rose.
he didn't know she was scared of loving him because he was something she could never have. he was cheerful, pure and he saw beauty in things she wouldn't even bother looking at. she was scared she was icarus, flying so close to her sun that when she'd let herself fall in love with him, everything would fall into pieces and she'd be falling eternally.
it wasn't a tale with a happy ending, but it was a tale of a moment in which they found something beautiful in a situation where nothing beautiful should've been able to be found.