Perhaps love itself will always be a mystery. Why a relationship works or doesn't work, however, is not a total mystery. It is only a challenge that you can easily meet if you have the tools, starting with awareness as the key.
The nine secrets are good but not quite secret: Notice small stuff, create safe spaces, tend the fire. Perhaps too brief but engaging. Like Sucks and Gremlin, this relies heavily on anecdotes to make things clear, and to good effect.
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