A woman's loyalty is not constant.

It's tied to your state at every point.
Women don't stay in a relationship because they should.
She stays because she finds you valuable.
If you fall off, start being lazy, abandon your vision, ambition and fire, if you stop growing, stop improving, conquering and achieving new things, she is gone.
Not because she is cruel or a gold digger, it's because women are wired for survival.
When you stop growing, it signals to them you're a long-term loser.
Women hate to be with losers.
Stay ambitious, stay disciplined, stay valuable and you will be irreplaceable.