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When the husband is displeased with his wife
When a man hath taken a wife, and married her, and it come to pass that she find no favour in his eyes, because he hath found some uncleanness in her: then let him write her a bill of divorcement, and give it in her hand, and send her out of his house. And when she is departed out of his house, she may go and be another man's wife. -- Deuteronomy 24:1-2

FIRSTLY....consider it done that I will be remembering you in prayer at this time.

SECONDLY.
I have been in exactly the same position as you many years ago. Th one thing I learned from that time, which has always served me well throughout my life is this, LET GOD BE THEIR JUDGE DEAR ONE!!!!
Do not harden your heart and become bitter, but come before God in prayer and ask HIM to remove ALL HURT, PAIN, BITTERNESS, RESENTMENT and UNFORGIVENESS from your heart.
If you do not do this, I can promise you that you will be giving a foothold and a stronghold to the devil.
You may say...."It's easy for you to say that....you are not in my shoes".......As I said earlier, I was in exactly the same position and LEARNED that to hand the whole issue over into Gods hands, was far better than it could ever be in my hands.
Remember the story of Jesus when the woman was brought to HIM when she had been caught in the act of ADULTERY????
What did Jesus do as the mob were about to stone her???
He said:
John 8:7
So when they continued asking him, he lifted up himself, and said unto them, He that is without sin among you, let him first cast a stone at her.

Jesus would say the same to you tonight dear one. Don't be the one to throw any stones, do not fall into the hands of the devil by giving him the pleasure of watching you "lose it".
We can call what you are going through right now...an AFFLICTION, brought upon your marriage by the powers of darkness, seeking not only to destroy you but all of your family.
Be assured that God will deal with this in HIS way if you leave it completely in HIS hands.
Your husband may well think he is having fun right now, but you read this verse:
Hebrews 11:25
Choosing rather to suffer affliction with the people of God, than to enjoy the pleasures of sin for a season;

I counsel you to "SUFFER THIS AFFLICTION WITH THE PEOPLE OF GOD", while many of us uphold you in prayer to our heavenly Father.
Your husband however is "ENJOYING THE PLEASURES OF SIN FOR A SEASON", and he most certainly will reap what he has sown if he does not repent of his vile sin.

You have no need to worry one little jot about your husband being blessed, because God does not BLESS SIN and the sin of adultery is no different to any other sin. It is abhorrent and detestable to God.
GOD WILL DEAL WITH YOUR HUSBAND!!!!!

Exodus 20:14
Thou shalt not commit adultery.

Leviticus 20:10
And the man that committeth adultery with another man's wife, even he that committeth adultery with his neighbour's wife, the adulterer and the adulteress shall surely be put to death. <

Proverbs 6:32
But whoso committeth adultery with a woman lacketh understanding: he that doeth it destroyeth his own soul.

Mark 10:11
And he saith unto them, Whosoever shall put away his wife, and marry another, committeth adultery against her.

AND GOD SAYS:
Revelation 2:22
Behold, I will cast her into a bed, and them that commit adultery with her into great tribulation, except they repent of their deeds.

In closing, please please please, do not go down a road which will cause you any further pain or anguish....LEAVE IT WITH GOD...HE HEARS YOUR CRIES AND SEES YOUR TEARS, AND HE WILL BRING YOU THROUGH THIS...I PROMISE YOU HE WILL....I HAVE BEEN THERE, I KNOW!!!!