Brother Norm I'm sorry to hear of your pain. I cannot speak from experience but I can speak from GOD's given wisdom in His Word. You say you have no one to turn to, but Jesus is who you can turn to. He is the Healer of all pains and the greatest Listener above all. Turn to Him and you will receive what seems unfathomable at this time, peace in Jesus Christ. No circumstances no matter who painful and difficult can hinder GOD from giving you peace in times of trouble as these.
I will keep you in prayer. Please try your very best to forgive her and pray for her. It may seem beyond the realm, but it is what GOD has commanded us to do. Forgive each other "77 times" (always forgive).
You know brother, remember that majority have committed adultery against the Lord Jesus too. No pain of ours is greater than what Jesus feels in His heart when His own children betray Him, and the rest is history.
My point is GOD understands your pain of being betrayed and walked away from.
James 4:4-5
4(
A) You adulterous people![
a] Do you not know that friendship with the world is enmity with God?(
B) Therefore whoever wishes to be a friend of the world makes himself an enemy of God. 5Or do you suppose it is to no purpose that the Scripture says, "He yearns jealously over the spirit(
C) that he has made to dwell in us"?
Jeremiah 2:20
20"For long ago I(
A) broke your yoke
and burst your bonds;
but you said,(
B) 'I will not serve.'
Yes,(
C) on every high hill
and under every green tree
you bowed down(
D) like a *****.
Forgiveness is key and prayer is the most powerful gift GOD has granted to us...
Matthew 18:21-23
The Parable of the Unforgiving Servant
21Then Peter came up and said to him, "Lord, how often(
A) will my brother sin against me, and I forgive him?(
B) As many as seven times?" 22Jesus said to him,
"I do not say to you seven times, but seventy times seven.[a] 23
"Therefore the kingdom of heaven may be compared to a king who wished(C) to settle accounts with his servants.[b]