OP, I can see the not wanting to end a relationship just because their might not be any children, especially if you yourself aren't in that place yet where you categorically know that this is what you want now
But this isn't the only reason is it? you want commitment, and he's made it clear that that isn't what he wants. Is this relationship so good that you are happy to only have it on a part time basis until he finds the person he wants to settle down with?
There's nothing wrong with not wanting to rush into marriage, kids and a mortgage just yet. But there's a difference between seeing someone as your future and not thinking you will ever want to settle down. Saying he never wants to settle down gives a very clear message - he's into you on a part-time basis, but he doesn't love you.
Try and visualise your life in five years time. Where do you see yourself? still meeting up with him only on weekends while your friends are all off building their lives, relationships, families? Do you really think that weekends only is sustainable for ... how long exactly are you prepared to do that for?
I know my relationship where I see my dp weekends only has an end point when ds leaves school, and that is very much worst case scenario. But that was something we discussed very clearly before we even got together, I was very clear that any relationship was on the understanding that, in the event of a serious relationship, I wouldn't be in a position to move because of ds, because I had consciously decided to stay here in order to maintain an equal relationship for ds with both me and xh. We were friends before we got together so he knew the score anyway. So when we realised that we were serious and wanted a future we already knew what the terms of that would have to be.
It sounds to me as if you and your bf have until now been having a lot of fun (nothing wrong with that) but have been happy with things the way they are, until it's got to a point where you decided to talk about where you're going. After a year I'm surprised that his revelation that you are in fact going nowhere in terms of a long-term thing has come as such a surprise. It seems obvious that you haven't had good communication until now if you didn't even have an inkling that this was where his head was at. Not so much in terms of children but definitely in terms of staying together in future.
And you say that you have now ended your relationship, did you not clarify that at the weekend? have you not heard from him? If you were on different pages in terms of future commitment and wanted to stay together you would surely have talk, talk, talked until you had resolved things one way or another. Instead you have just gone your separate ways and stopped communicating?
You know the answers really, right now you may not wish to face them, but they are abundantly clear to anyone reading this thread.
I don't think he's wrong or manipulative as some have said, but I do think that while he may like spending time with you a lot, he doesn't love you or want a future with you. If that's the kind of relationship you want then that is good for now, but can you hold on to it knowing it's just casual and never knowing when it's going to end?