I have finally came to realize that my ex-boyfriend has strung me around for 10 yrs now. I asked him to tell me why he waited until we hada child to decide that he didn't know what he wanted out of life to give me some closure in this chapter in my life, but he will not answer me, why is that?

Because he doesn't have the answer either! You really can't count on men to answer you directly and honestly... (not saying that all of them are like that) but some are!
I've been married and had a kid, and I was in the same situation as u... my ex decided he will be better off single... and without a kid... then trying to play a role he's not good at!

I'm divorced now with a beautiful child that loves me, and she made me a better person and a happier mother! Now he's calling and calling trying to get back into our lives (after 2yrs)!! Believe me... focus on YOU and the BABY right now... and time will help you heal!
You and your baby are better off without him! He will always remain her father... and U guys can deal with that issue when the baby is all grown up... but your child needs a strong, happy mother... in order to raise him/her and make him/her a better person and as strong as you! You are UR BABY's ROLE MODEL! SET A POSITIVE EXAMPLE!

Just don't quit believing in yourself... and your ability to be happy on your own! Because once you realize that... you will be FREE of questions and doubts!

I hope this helps! :)

He has no clue. Your closure is he is gone, and you have a life to build without him.

Do you really want an answer? If so, like previously mention, he doesn't even know. Be happy your no longer in a relationship with him and that's he can be someone else's headache. I can only hope he's helping out in raising his child with you.