But bearing is about the degree of frustration, hurt, or turmoil.
Endurance speaks more of being able to bear such things over a period of time.
For example, maybe my SO has said some very unkind words to me. How much endurance my love has relies on my willingness to hang in there for as long as it takes, to find the answers I'm looking for, and healthy solutions to difficulties I have with the relationship. Without such endurance, I can easily find myself quitting just before important insights appear. Enduring all things doesn't mean that I need to stay in a relationship that is clearly unhealthy for me. What it does mean is that I don't leave simply because I can't stand the turmoil anymore.