Sounds like a pretty shitty person. To some people, loyalty counts for nothing.
I think the value is to reflect upon our own situations, and mentally file away these stories for future reference and reflection.
It's like you took away the literal opposite meaning of what OP wrote. The entire post is him sharing his personal crisis and total lack of purpose and motivation. He is literally saying he does not know what he needs to find his way out of that.
But he decided he needed to not be in a relationship (or in that specific relationship) at this time. How does that make him a shitty person?
Surely you're not suggesting he should stick with her so she can partake in the financial gains.
The alternative is to live a lie or never change.
He is going through an unanticipated personal crisis, and decided he needed to be alone at this point in his life.
Should he have kept the relationship going because he has money now?