You know, so many people just don't value a commitment they (usually) make before God and man. Once a person has decided in their hearts that the marital relationship is just not important, they can justify affairs, divorce, all sorts of bad behaviors. This society has become so immoral, and I believe that the collapse of the family has been the most tragic result of that.

Your friends just want you to stop hurting. They perhaps never tried to work on their R, so they think giving up is easier for everyone. Perhaps you could surround yourself with a group of friends who are pro-marriage, pro-family. It is much easier to be around people who share your own mindset.
vc