Mainly, this happens with people who are very proud, so it is hard for them to say sorry, as a result of this it is very likely that these people are resentful, apathetic and have very few true friends.
Apologizing sincerely shows that this person is a mature person, because not everyone accepts their mistakes, and even more says "I'm sorry".

• How do we handle friends or people who will never say they feel it?

With this type of people, there is to be forewarned, and clear that they will never accept their mistakes, so we just do not disappoint ourselves and in general have such an intimate friendship with such a person, because you can have many disappointments.

• What is the importance of saying "I'm sorry"?

A simple "I'm sorry" does not matter at all. A sorry is really important when the person who apologizes understands his mistake, think about not committing it anymore, because if you make the same mistake and the "I'm sorry" has no value.