Any relationship requires extreme commitment. Think about it. A couple gets together based on passion, and when the passionate phases start to die down, the relationship switches to rely on financial, mental, emotional, and communication stability. But there are given periods during which the relationship needs a boost of sexual and passionate connection. When there's a lack in any of the mentioned during a repeated cycle, a partner can and will act in searching for a new stimulating adventure. This is proven.
So, yes, a relationship takes a lot of work from a great amount of demands, especially on the male's side, not just the female's side.