Having been in OMW's shoes and also attempting suicide I would say that her family will be well aware of what is going on. They might not understand FB etc. but they will be looking for signs of continued contact.
OW in my sitch also stated I was bi-polar and psycho and deranged, ( she had to justify her two faced actions somehow). I even still have a letter that OW's father wrote to my H when my H broke it off with OW, going on about how frightened his daughter was by what a woman in my mental state would do- if she was that frightened she would never have messed in my M in the first place. It's complete crap. OMW's life has just fallen apart - as has yours.
I did speak to OW's H a couple of times and we drew some comfort from one another BUT remember that OP's S is never your friend; they always have their own interests at heart and will put those first. So if you do talk to anyone about this I would suggest it is the OM's W - I suspect she is nowhere near as fragile as your W is making out.
Saffie me 46 H 46 M in 1986 D20,D18,S16,D13 H's A 01/05 to 07/06 H recommitted to M 07/06 renewed vows 09/06 Going from strength to strength