I really sympathize with your situation. However, love is not a feeling - it is an action. Sometimes, you have to love (do the actions) before love (the feeling) can come back. This takes time, but most of all commitment and willingness to work/communicate with the other partner.
That said, you really need to think about the pros/cons of both situations - especially that of your ex husband. Let's say that you did try to make things work out with your ex. Has he truly change or demonstrated a commitment to learn, adjust,and do what is necessary to make a relationship with you work. Good intentions are not good enough. Same applies to you also. What changes would you have to make for the relationship to work should you choose to go back to your ex.
You indicated that you had lost the ability to communicate and truly did not like each other. Why was that the case - what was the root cause? You married him for a reason, so at one time there had to be communication/love there. Could it be that both of you got complacent and took each other for granted?
It is really important that you identify the cause of the divorce as whatever you decide to do, you don't want those causes to sabotage your relationship again.
Ideally, I think it would be better if you tried to make things work out with your ex. There is nothing more wonderful than a family that is back together - truly committed to each other.
In either case, I think you should also consider what type of person you need to be for either relationship to work. Relationships are a learning process about how to satisfy each others needs and what to do to keep the passion/love burning.
I would also think about who is really going to be there to support you, love you, take care of you, provide your needs, etc. Right now your new boyfriend sounds like he is really devoted to you. However, almost all relationships are like that in the beginning. Thinking long term, what type of person do you think he is going to be a year from now, 5 years from now, etc and how does that compare to your ex, especially in regard to how he is acting now?
You want to put yourself in the best situation where you have the greatest chance of truly being happy.
