In their early days in the relationship they have a fight. Joe is loud and passionate and Nicky is cold and silent. This leads to a big misunderstanding that lasts for years (maybe even into present day) which means they break up. They might get together a few times for comfort or as fuck buddies, but both are secretly hurting and pining for the other while believing the other does not want the same.
One day one of them sees the other doing something innocent with someone else that makes them think the other has found a new love.
Joe/Nicky argument and misunderstanding
One day one of them sees the other doing something innocent with someone else that makes them think the other has found a new love.