When your best friend is the cheater (NBR)

~katielady~

So my husband and I have been together since high school and my best friend and his best friend were on again off again forEVER then finally got married 3 years ago. 

Today I found out that she cheated on him on Friday.  Things haven't been great for a while, they were in counseling, so she basically wanted out.  My husband's best friend is very much the victim in this and I just feel so bad.  I've known him forever and want to be there for him.

I've talked with my bff and told her that while I completely disagree with what she's done and that it was a terrible way to get out, I'll also be there for her.  DH on the other hand is understandably PISSED.  Any words of wisdom out there?  I am at a loss.