Hi OP - I am so sorry that you are in this situation.
I can see both sides of the coin - you couldn't have envisioned that your biological clock would start ticking like a bomb, but at the same time, you both went into the marriage on the same page that children weren't wanted.
So he is simply standing by his initial view, whilst you have changed your stance.
That's not meant to blame you in any way - I actually think it's way more common than people realise.
When we're growing up, we always hear about how the secret to a good relationship is learning how to compromise. But we rarely hear about what to do in situations like this, where there is no compromise possible. You either have a child, or you don't. There aren't many shades of grey to explore in this scenario.
I've only seen one person recommending that you go for a "happy accident" (someone was saying "omg so many people are suggesting that). Whilst I can genuinely see the appeal in that (especially for a desperate woman), please don't go down that route. Men aren't sperm banks, just as women aren't incubators. Even if a man decided to have nothing to do with the child, it's still a huge HUGE thing to force onto someone. And it's wrong. It's absolutely wrong and there is no circumstances which would ever make it right.
You really only have two choices here.
You either accept - completely - that you will never have children, and you try and fill your life with other joys. Travel, pets, whatever.
You decide that you cannot accept a life without children, and you leave your partner. You don't have to spend years looking for someone new. You could always use a sperm donor. Hell, don't they even screen donated sperm to get rid of any potential bad shit in there? Score!
Again, these are black and white choices. There are shades of grey, but they are only going to drive a wedge in your marriage, and cause you great pain. Stay in the marriage and "hold out" that he might change his mind? Even if by some miracle that does happen, what do you do if for some reason your fertility has nose dived? How much will you hate and resent him for making you wait years before trying, for no real reason?
I'm not saying he needs a reason, but let's face it - if your partner is desperate - to the point of tears and heartbreak - for something and you are saying no, it is much easier for the other person to accept if you can give them an actual concrete reason for saying no, rather than just "well....I don't really feel like it..."
I don't know. I just get the impression that he is pussy footing around.
I would have more respect for him if he was saying: "I'm sorry love, but I absolutely, concretely, definitely do not want children. In fact, I have been thinking about getting sterilised, as I know that I don't want my life to involve children of my own. I like being able to hand babies back when they smell or cry. I like being able to travel when and where I please. It's not happening".
At least then he is clear and you know exactly where you stand. Instead he is giving you the
"Oh well, there's no reason really. Maybe.....if it happened, then we could deal with it, but it's not my PREFERENCE, and I wouldn't want to actively TRY to get pregnant....because, y'know....I don't want to settle down yet....".
That's very hogwash.
If you do decide to stay together and forgo your chance of children, I would strongly recommend that you ask him to get sterilised. That way you guys don't need to worry about contraception anymore. If he knows he doesn't want kids, then it should be a huge weight off his mind.
If he doesn't want to get sterilised then I would think long and hard about this relationship. He would basically be saying that he doesn't want children NOW, but might be happy to ditch you for a younger model if he changes his mind in his late forties.
I mean...if he deffo doesn't want kids (to such an extent that having his weeping wife in his arms doesn't make him change his mind - so obviously he is sure about it), but is willing to keep the possibility of it happening in the future....where the fuck does that leave you?