I dunno, I think this just reenforces the fact that he probably only married Allison for her money.

Tsk, tsk, what an aweful bohemian.

He had an affair... we can't really say why because we don't really know their relationship. It could be he just married Allison for her money, but in the end he came out right.

Mark: In honor of Benny's wife
Roger: Muffy!
Mark: Allison. Pulling Benny out of the East Village location.
Roger: I wonder how Allison found out about Mimi.
Mark: Maybe a little bird told her.
Collins: Or an Angel.

Love that scene.

Mimi and Benny dated before he married Allison.