@Diabetes123 I can't give you advice about whether or not to go back, I can only speak from my experience. So, for what it's worth...
My ex is an emotionally abusive git, but like many, can be incredibly charming and we have had some great times and have two gorgeous children. If I went back, there would be no second chance for me, I honestly believe he would seriously harm me if he started to feel I could leave again. But, even with that knowledge, I considered it just to be with my DS and to make everyone feel better, like I always do. And that would be awful. I know how you are feeling.
To cope, I phone my mates and cry at them (I am very lucky to have 2 very close friends who support me to the ends of the earth), I google stuff about how to cope and positive stories of kids and people doing better after divorce. I make tea. I put on Friends on Netflix, I get out the flat for some fresh air and I make good plans for the future. I do not contact my ex. I send the kids funny memes and say 'I love you'.
Time is helping and it is definitely getting better. My DS is coming round and our relationship is becoming a lot closer. I send him cards and letters sometimes so I know he knows I'm thinking of him, but always funny..he is a 13 year old boy and doesn't want angst...but always with a 'loads and loads of love, mum' in them. I have told him many times that it is not him I have left, that he always has a home with me and that I love him more than anything. I also act completely normally with him. He doesn't want the drama. He wants help with his History homework, copious amounts of food, an occasional hug and a laugh.
I am studying for a degree with the OU and have a new job. I am keeping busy!
Good days and bad days. Like I mentioned, my ex is very manipulative and knows the buttons to push. I have huge and exhausting battles ahead. I have done my best to get the message over to him that the kids need both of us and they should not be emotional sounding boards or pawns. He completely ignored me 
I know I have many more hard times ahead and some bloody ugly, sobbing, snotty tears and anguish, but each day is another step in the right direction 