In the end, Lane returned to the ballroom with Damien. Although his preparations weren't complete, and he didn't really feel like going back to the boring gala, he still did. For Damien's sake. If he said that he didn't want to, Damien would probably assume that Lane wasn't actually okay, no matter how much he claimed that he was, and worry unnecessarily.
And excessive worrying shortened people's lifespan. Since the two of them were going to get married (eventually. Lane might not have proposed yet, but he was quite confident that Damien would say 'yes'), Lane had to ensure that the man would lead a long life. He couldn't have his spouse dying prematurely, now could he? That would be… not nice.
Also, the wrinkles. The more Damien worried, the more his frown would deepen, and that would lead to him developing wrinkles. That was another thing Lane couldn't allow, as Damien's future husband.
