I'm deeply saddened and troubled by your story sister girl, and I commend you for your strength, for I never know how anyone could react under such circumstances... I'm encouraged to hear that you are a woman of faith and I think it is because of that, by the grace of God, that you have the strength to forgive him.
Jesus tells us we are to forgive our brothers and sisters (I would assume husband and wives) seventy seven times.. Love your husband, forgive him for what he's done, give it to God, I'm learning that He can do anything and nothing is too hard for Him. I pray your husband has recognized the pain and hurt he's caused and has repented and changed his ways... and what I truly believe, is as you continually pressing down, holding on and loving him, your husband will come to recognize the unconditional love from you and it'll cause him to love you even more and in the same, if not, greater manner than you love him.
I know that I don't know the feelings you have now, and quite honestly I'm a young 26 year old male and have no idea what marriage is like or infedelity from the perspective of a woman, but I believe in God and His word, and I believe that even through this, God will use it for good. Romans 8:28, "And we know that in all things God works for the good of those who love him, who have been called according to his purpose."
With that being said... I believe, what you are experiencing is for God's glory, because as you press down, forgiving your husband and loving him, building him back up through Christ, better days are coming... your best days are ahead of you. I say this because this is what I believe in your situation... through the Holy Spirit,
Genesis 2:18 (NIV) says,
"The LORD God said, "It is not good for the man to be alone. I will make a helper suitable for him."
John 14:26 (ESV) says,
But the Helper, the Holy Spirit, whom the Father will send in my name, he will teach you all things and bring to your remembrance all that I have said to you.
John 16:13 (NIV) says,
But when he, the Spirit of truth, comes, he will guide you into all the truth....
Romans 8:26-27 (NIV) says,
“In the same way, the Spirit helps us in our weakness. We do not know what we ought to pray for, but the Spirit himself intercedes for us through wordless groans. And he who searches our hearts knows the mind of the Spirit, because the Spirit intercedes for God’s people in accordance with the will of God.”
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It's my interpretation that although men are the head of the family and his wife, that wives are the ones that really keep the husband in check. When he veers of the path to the right or the left, the wife whom is by his side is there to slap him on the thigh and remind him to get back on track... and that's what I believe what you are going through, is indeed a calling for you, as well as him.
The enemy tried taking your husband away, clouding his mind with evil and wickedness, to destroy you and your family and the purposes that God has planned for the both of you, but God is God, and is all powerful and stronger than anything the enemy can throw at us.
Stay where you are sister girl, forgive, love and help your husband and believe that God can do it!
Jesus tells us in John 11 (I love it cause I read it earlier today), "if you just believe, that you would see the glory of God."
I believe it..