The most difficult thing after marriage is learning to trust again. If a marriage has failed, a person needs to learn from that experience and try to gain an understanding of why exactly it failed.
If you use that experience and avoid certain mistakes in your next relationship, and possible subsequent marriage, you will surely be successful next time.
Unfortunately, the more relationships fail, the less interest and effort are shown in subsequent relationships.
Take a look at this article on GoMarry.com for more information