It's like this...

michelle is an angry black woman with a chip on her shoulder against "whitey", and an attitude that shouldnt be in somebody so priveledged as she was growing up.

She loves/craves POWER more than anything, and she will NEVER divorce him, she likes the taxpayers money too much to spend as she pleases, she likes being in charge too much and that can only come with staying married to him.

She isnt worried about other women, she is worried about other men, she knows this facade of family man with 2 little kids can only last so long, till a gay man HAS to be with another gay man.

She just hopes he doesnt get photographed etc while doing it.