I think he has told you in no uncertain terms that things are over. The "maybe later" thing is very common to say during breakups to give the other person a little hope if the other person isn't handling it well.
You cannot force a relationship. It's over. You should accept that, grieve the loss of the relationship, and move on.
Regarding kids - having kids isn't in the cards for everyone. While we all feel that biological clock ticking down, and sometimes it doesn't work out - and that's OK. There isn't anything wrong with you if you don't have kids.
Ask yourself: Do you actually want kids? Or is it social pressure? (The idealistic house with a yard, husband, kids, etc.). At this point in your life, you can make the decision for yourself. If you want kids, make it happen without a man. If you don't want kids, accept it, rid yourself of the guilt, and enjoy your life.