what to say to a friend whose husband's been cheating

She posted this on her facebook -

just a few hours ago, my husband confessed that he had been cheating on me for roughly a month. why post it here? shock i guess, but you all are my family and friends and i love you...i just needed to vent...thats whats facebook is for, right? we post about birth, death, and everything in between...so infidelity is life, and is therefore fodder for fb...fml right?

I've been out of touch with her for a while, but we actually had a previously scheduled phone date for this evening. I always want to be supportive. It's great that he came clean about it, right? But Oh got that sucks. It breaks my heart.