Agnes is a hypocrite.

Remember Agnes? Biff's ex wife? Well guess what SHE did! That's right, she accused ME of being a homewrecker, which I was not, but which she now IS!
Back in the old days Biff says to Agnes, gee you sure spend a lot of time talking to...let's call him Alfred. What's that all about, hon? Nothing, we just talk, nothing's going on, blah blah blah.
People stopped talking to each other because of that little conversation. Lives were affected because of "it's nothing". And now...
She is LIVING WITH ALFRED!!! Alfred just told his wife like a month ago that he wanted out and told his kid, who Biff talks to a lot, that it's not because of Agnes, but if he winds up with her "don't be mad!"
And now they are living together. So I ask Biff how he feels about this and I guess it answered some Qs he had and it sure makes ME feel validated.
All's well that fucking ends well.
Move on.