http://mydevotion.com/logos/asp/viewpyrrep.asp?forumid=5&forumtype=2&topicid=2052&table=prayer 

Thank You so much for responding to my prayer requests. I have been feeling so down about it all.God is good, I guess I will try to go and speak to my pastor. I have been married for 18 years and my husband is still not saved. I pray for his salvation. Thnak you for your compassion! 

Hi
I don't think you should be too embarrassed about going to see a pastor, because this kind of thing certainly isn't unheard of. A similar thing happened to me with my ex-fiance, who wasn't a Christian, my ex-boyfriend (who is), and a friend's husband (another Christian), who is currently involved with internet pornography. It's the old sin of temptation, so your pastor won't be shocked by it. I know how awful it is to have your loved one behaving like this and the feeling of betrayal. My advice would be to not waste any money on a private investigator; you already know what's going on. Talk to your pastor about it; keep taking it to God. Although your husband isn't a Christian, God cares deeply about your marriage, so place it into his care. This is happening to other women out there, so you'll be able to find support from others in the same situation - here on the net at least.
Stay strong, God loves you.
Joanne.