Our expert says:
Drop him and have nothing further to do with him. You are fortunate if you have not contracted any STD, HIV or other ailment, due to his infidelity and promiscuity. Yes, it was foolish for you to get unhelpfully involved in the way you describe.
Now, your ex might find a greedy lawyer ( there are many around ) who will agree he should consider suing you for defamation of character, but that would be an extremely expensive and difficult case for him to try to bring.
Its hard for him to prove what you did, and that it was defamation, and even to establish that he had any reputation worth a cent that was damaged. Would his gf and her brother really want to testify in court and get cross-examined about their own behaviours ? He may grumble and threaten, but it would be very expensive, difficult and risky for him to actually take any such action. If he did begin to seriously do so, get legal advice, from a law school free law clinic, if necesary, to best defend yourself.
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