I suppose to Lynn he was cheating on her, but with his super-heroing adventures. And they have been split for nine years. I doubt Jefferson has been a monk in all that time. There must be other women who crossed his path. In future seasons, if they're desperate for another plot line, a little kid could show up at his door, with static shock powers, wondering if Jefferson is his daddy.
Anyway, I do think Lynn resembles some of the depictions of Hera, in her demeanour.