He won't stop contacting another woman, why does he get annoyed with me when I tell him to stop?

Anonymous
My husband recently signed up with face book as so did i, but 2 days ago I went through his pc and found that he had searched up a woman he knows I get angry about, this woman knew my husband was married with kids and yet she would call him, email him and they would go out drinking, (obviously he didn't tell me the truth who he was with), when I found out I put a stop to it, and called her, she told me they were friends, I had an overwhelming feeling that she wanted more and that my husband had turned her down, 5 years later I find that all my suspicions were right, she asked him to sleep with her and since they haven't spoken in all this time and my husband knows how I feel about this, I was furious and hurt to find that he had searched her name on the site, we had an argument over it and I cannot help feeling that he is protecting her rather than respecting me as his wife, and our family, am I wrong to tell him that I don't want him to have any contact with her or am I over reacting, I can't help feeling that maybe something happened between them and that is why he won't or can't let go, we have been together for 17 years, I was apparently all he wanted and still wants and despite him telling me that 3 months ago I cannot get his woman out of my head and I feel as if I'm going insane, has anybody out there been in a similar situation, we have children together and she knew this, I feel as if she was laughing her socks of at me and still is, can anyone help me.
Updates
+1 y
Been 3 days since I found out he looked up the woman face book, we've hardly spoken, he is trying but to be honest why the hell should i, hasn't said sorry or he will drop it, so what do I do now, I've no found that he's changed the passwords on pc and msn?
Updates
+1 y
Ive tried to make him see how I feel that he would want to talk to someone who fancies him, but its not working, he's making me feel like I'm too blame, I feel sick that he wants to find her when I'm here and she isn't, he defends her when I try to explain.
He won't stop contacting another woman, why does he get annoyed with me when I tell him to stop?
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