What would you do if your ex contacted you and she wants to hurt your relationship with your wife

I would definitely tell my wife about it...but I would do what I did the first time she tried that. When my wife and I first got together, she went to my wife to "warn" her about me. There was nothing to warn about, she just couldn't stand that I had found someone and the person I found was a former friend of hers. Anyway, when my wife (girlfriend at the time) told me about it, I went directly to her and gave her down the road. I told her she had ruined my life once already and that I'd be damned if I was going to allow her to do that again. I basically told her to stay away from my girlfriend or there would be hell to pay....never had any problems with her since.