Both of them were good friends during Zayn's time in One Direction.
If Zayn wished to choose anyone from the boys, it would've been Louis. It's because Zayn can't play football, while Louis can.
Louis always used to stare Zayn while he was tweeting. The reason was Zayn used to take his tongue out.
According to Louis, Zayn smells the best in the boys.
Zayn said if he was stranded on an island, he'd take Louis if he had the chance.
Louis and Zayn snuck out into Sydney without security. They eventually got lost, chased by fans and were nearly hit by a car. They couldn't pay for the taxi since they did not understand Australian currency. In the end, Paul had to find them.
They got into a fight on twitter, and Zayn replied by ending the friendship with,"@Louis_Tomlinson remember when you had a life and stopped making bitchy comments about mine ?"