In November I called my husband on his cell to ask where the car was...he forgot to turn his phone off and I heard a 15 minutes conversation between him and a mother of our kids playmates.  They were in the car together in his employers parking lot...After saying goodnight to my kids I went to her house and confronted her...she denied it. The next morning my husband screamed at me for going to her house, evidentally she called him and told him I had been there.  He said that I was not to EVER go to her house again.  I told him I wanted him to stop seeing her..he said he wouldn't because she is his "friend"..I asked if I could be her "friend" too, he said "no" because she doesn't want to be my "friend".  I should have told him to leave right then and there, but I didn't.  Eventually I became very depressed, nagging him constantly about internet porn, giving her a Valentine card, handmade Christmas gift.  He is making her and her two daughters each a jewelry box in our garage. Of course he wouldn't admit it, but I knew. He has her two daughters (age 16,14) email addresses in his email address book, yet doesn't even have our son's email address. He couldn't take my constant nagging anymore, so he finally moved out on 5/1.  He said he needed sometime alone to sort things out and that he wanted a place closer to work so he could work late as he was getting alot of pressure from his boss.  I thought it was a good idea.  Well yesterday morning I called him before he went to work and he sounded really strange, so I decided that I would surprise him at lunch and buy him a CD and bring him a bottle of champagne and we could have a nice time together.  I sat in his employers parking lot for over an hour before the security guard came and said he had not even been to work. I called/texted him several times, no response. Finally at 4:45PM he called me back saying that he was at work and wouldn't be able to go to a meeting that evening with me..He knew that I had been to his work so he couldn't lie about not being there...He said he was busy running errands..BUT I know he was with his "girlfriend" that day.  Should I tell her husband?  They have three kids and she has told him that she will never leave her husband.  They own alot of property together including a vacation home that she spends most of her time at and her husband is a university professor, which she is very proud of.  Before my husband met her, she was my "friend" when the kids played together at our house (never hers) and at the park.  She talked many times about her many male "friends" that she was completely infatuated with...When I asked what her husband thought of all of her male friends she said that he probably has a female secretary as his "friend".  Last fall my husband started going to her church on Sunday morning, just to see her (her husband didn't go) as I worked on Sunday mornings.  Most of their communication had been via email as she went back to her vacation home a while back. I believe she is back in town because I am completely convinced that he was with her yesterday, though I can't prove it.  Should I tell her husband....since he is at the university it is VERY easy to get a hold of him?  The semester is up this week and I don't know if he will leave for the summer or not.  Should I confront her, as he might have told her that I kicked him out of the house because I couldnt' stand his internet porn obsession?  I suspect that he is not being truthful with her and that she doesn't know that I still love him.  I think he is using her.