You didn't say why you separated from your husband and I'm not sure what you mean by "raising your children the way you should."
Going back to him only for the children will hurt them in the long run. They know when parent's stay together only because of them and it causes loss of self-esteem and guilt feelings as they grow up.
The other one you only think you love, so I don't believe that you are ready for anything permanent with either one of them right now.
If you still have feelings for your husband, maybe marriage counseling will help you put things back together with him.