@Sarah_Flagg i am in the middle of divorce right now. Married 10 years, 2 boys. This is my logic: what was we teaching our kids about love? Kids know when parents argue, they feel the tention, even if mom and dad hide it from kids. Do i want my kids to grow up thinking thats "normal" married life. Thats what all parents do.
Its been a year long journey so far and me and boys are adjusting to new life. They still get sad at times and i explain them that grownups sometimes just cant be friends anymore and have to live in separate houses.
I also found great kids books about divorce! Read them yourself first, before you read it aloud to get prepared.
Bottom line, if you doing whats best for you- you doing the best for the child! Your son needs you to be happy so he learns to be happy