I've pointed it out elsewhere in this thread, but Nick has a flavor of spergery that means he can't just be normal. He has to have a new idea, he has to be doing something new, he has to have a different take. He can't just go with an option someone else could have picked. It's the hipster thing.
This helps him in his career, because it means his take on an issue isn't the same as you'll hear from someone else. But it also means he can't stop for a second and say things like "I'm too busy with my show and stuff to worry about dating". Because that's something someone else would do and he needs to be different.
Like most of his issues, I suspect the spergery will vanish if he's forced to grow up a bit.