I do not agree with faith or Rocked...but I will leave them up.
And unless I missed something, her not coming home was BEFORE she said she gave him up and decided she wanted to start dating you.
Your AS IF IS a delicate thing. The very thing you ASSUME you can often create. Unless you have a new reason not to trust her (if you mean by driving by you saw his car there), then trust her. If you saw his car there, keep your eyes and ears open.
dbmod, with respect, I believe you HAVE misunderstood the situation. His wife stayed out all night and all weekend AFTER she said she was no longer seeing OM. Sinclair is quite certain that she has lied to him. Again, with respect, I think your criticism of Faith and Rocked's responses stems from this misunderstanding.
I would be very interested in seeing your advice assuming Sinclair's W is lying to him. What do you suggest he does in that situation?