You've just made a very big deicision and it's completely normal that you feel this confusion and hurt. You obviously haven't taken the decision lightly, you seem to feel grealty let down by your partners failure to adapt to married and adult life. You really have to question whether, in the long term, a reconciliation between you and your husband is for the best. If he hasn't changed now you have to consider that he naver may. Being the children of separated parents doesn't have to be a damaging experience, they will adapt, so you shouldn't feel you have to try again for their sake.
You must currently be experiencing a mixture of extreme emotions. Love for your husband, anger at him, guilt at leaving him, concern for your children. My advice would be to not make any further decisions until your emotions have settled down. Wait a month or two to be sure you really do want a reconciliation and aren't just doing it out of panic induced by all you are currently feeling.
In a month or two your partner may also feel more able to talk about the circumstances.
Good luck with whtever you chose do.