Hmmm my only suggestion is to let him go. get out of his life for a while. In the past I guess you have told him you love him etc, and he knows he has an escape route back to you. Cut off that escape route and he'll see he only has that women, who hasn't left her hubby, and he might attempt to force her.... it could go any way really.
Just don't do anything stupid...I remembered a little while ago how much I did love my ex wife. She didn't see it because I got angry (understandably). However, I allowed my anger to do one or two things, and 'belittle' her in some ways, which she saw as being 'unloving' and 'revengeful'. At the time I loved her more than she could realise.... it was very hard. Be strong ;-)
