In my experience when a man is mute in the face of an easy question, it is because he knows he doesnt have a good answer.
Being in "the truth" was hard on your marriage. It also sounds like he is a very immature individual apart from or because of being a JW.
The bottom line is, all the things you wanted to do that he is now doing (concerts, boating etc) are available to you also Those are things anyone can avail themselves of.
Could it be that in the marriage you were cast in the role of the "responsible" one while he filled the "role" of the "fun" one?
If so, now is the time for YOU to write your own role. All of your maturity and goal setting has paid off. You have a good job and most importantly you have a clear record of caring and being a loving parent with your girls. That is an incredible achievement. They may not understand now but they will when they are older.
So now is time for you to ease up a bit on yourself and realize you dont have to counteract his ying with your yang. You are not in a role of having to over balance to create balance.
Take a deep breath and start small. Find some girlfriends or a single parents group. Or maybe you have some other interest that you would like to pursue. There are a LOT of people who want and need a friend. If there isnt a single parents group - start one.
You have done all the hard part - now its time to re invent a little bit.
All the best to you - you can do this.