A girlfriend whom a married man has a soulmate and true confidant and has primal connectness with.
The difference of that and a mistress is she is the only one/not interchanable and he wishes he was married to but circumstances make it impossible.

A true tragic modern day love affair that can last forever as it’s draw is so intense and magnetic.
He spent the afternoon with his side bride and saw yet another piece of her her longed to know.
by Movie Girl June 3, 2018
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