I will focus more from the scientific and biological point of view, again.

Why the fear of compromise? Well, I'll ask you another question, how many animals do you know who have only one partner in their life? So far I think I only know that characteristic in most birds, and a few mammals.

In fact, evolution shows how in reproduction there are strategies that make more suitable to certain animals. These strategies are for both males and females. One of these strategies for males has been to have more pairs to ensure more offspring per breeding; he who gets few couples will reproduce less and will be less successful for having fewer children.

This is the most common strategy within the animal kingdom, especially for most mammals. Now, behaviors are inherited from generation to generation to such an extent that certain behaviors are recorded in our genetic memory.

This behavior exists hundreds or thousands of years before the appearance of man, so it is normal to think that this behavior was also inherited to this and in fact it was. It can easily be seen in those polygamous relationships where you have more than one partner and many parents. But that also depends on some cultures or ways of thinking.

Now the conventional man if he can continue having this primitive behavior based on the strategy of '' more couples implies greater reproductive success '' making him feel insecure when committing to a single partner.

Of course, like everything in nature there are behavioral exceptions and obviously there are many men who do believe in commitment.