Its hard to give advice because I am a stranger on a website so whatever I say is thoughts of things I did or rather tried to make peace.
Keep your relationship with Heavenly Father. I know in times of distress it is often hard to know he is there to help and you may have a hard time seeing that He is guiding you. Read the scriptures and feel the spirit. If you live near the temple, go in there and feel the solace and peace. Its important in a major decision like divorce you know what the Lord is thinking and in order to know that, you have to be in tune with the Spirit and recognize the Lord in your life.
Divorce happens and I worked very hard for 10 years to make mine work. My husband cheated on me a year after we were married and on top of that was the emotional abuse of him twisting it around and blaming me because I was mad at him.
I talked with the bishop, I prayed to the Lord and I also saw a counselor and I frankly forgave him for his adultery the first two times.
When you walk out of a marriage you have to walk out with no regrets knowing you did all in your power to make your marriage work.
Your the only one that knows your unique situation and so the ultimate decision to divorce or stay or get counseling or whatever you do needs to lie with you, your husband and the Lord.
Feel the Lord's love for you, it will give you the strength you need because I know by experience that single parenthood is very challenging and the initial separation is emotionally, spiritually and physically taxing.
I will pray for you and if you want to talk, let me know.