Alexis doesn't deserve him either.

I mean, to be fair, if she knows about his marital status (including the fact that it's definitely not an open marriage) then she certainly doesn't look good either, but that doesn't mean that he wouldn't do the same to her if he married her, and nobody deserves to be cheated on.

If you want an open marriage, be honest. If you want another form of polyamory, be honest. None of this other nonsense.