Thank you for your question
My name is ***** ***** I shall do my best to help you.
Any action she might try to take would cost her many thousands of pounds - Defamation actions are notoriously hard to prove and expensive and given that you removed the offending post it is unlikely that the court would make any compensatory order.
Walk away from all of it and have nothing to do with this man or his girlfriends again!
Please ask if you need further details
If you get a letter then ignore it
She will not take any action on this - this is the kind of foolishness (sorry) that is exchanged online -and it will on no way of diminished her reputation amongst the people who read it