Here it goes:
There are people who are literally terrified of failing at anything, and relationships are just one piece of the puzzle. They give their all to whatever they pursue, and can’t face that their efforts might not bear out in something as important as a love relationship.
I have checked a few online dictionaries and each of them says that bear out means to support or confirm something or someone, besides, it is a transitive phrasal verb, but there, it seems, it was used as an intransitive phrasal verb.