Chances are he was like this before they met.
Either they can work it out and get through it, or they split.
They have to make this decision on their own.
Bruce is right, you'll be resented for any intervention you attempt. Or don't, as it happens. Classic damned if you do, damned if you don't situation.
What's his history ... you said he was married before, even if he wasn't, has he been completely faithful while in committed relationships, or has he had a little something-something on the side in the past? Past behavior is an excellent, but not perfect, predictor of future behavior.
"Gee, Good Friend, I really don't know what to tell you" IS an acceptable response.
Or ... keep any discussions you get involved in with her to a discussion of "options" without giving strong recommendations to any of them. They may include "sit down and talk this over with him without fighting about it" or "hiring a PI" or "hiring a divorce attorney" or "hiring a contract killer". She has to figure out what to do, not you.
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