How old is he? Sadly becoming increasingly common for men to say no kids in 20's/30's, waste the fertile years of the woman they're with at that point, only to break up with them in their 40's/50's and have DC with a younger partner then.
Also as pp have said, if you want DC even if you choose to stay chances are you will eventually resent him for that which will wreck the relationship anyway.
Personally it was a deal breaker for me and I was clear about that with my exh and the relationship before him (which ended for different reasons). I wouldn't have stayed with someone pre-motherhood if they didn't want DC.
Vinyl - I have endo too, I wish medics were as honest as that nurse, too many women are missing out on becoming mothers or only doing so after a real struggle because medics aren't honest.
See on mn in particular that 30's is "ideal" time for DC, physically/biologically it really isn't! Fact is biologically 20's are peak fertility years for women. Fertility starts to decline around 30, and really declines fast 35 onwards. Any woman that has ANY hint of gynae issues I would strongly recommend
A - pushing for a gynae referral, diagnosis and treatment. It's shocking how hard this is made for women in this country and its NOT just cuts/financing (though of course that is a factor) but it's that women are expected to put up with more than men. Several studies show it takes women up to 3 times longer to get a specialist referral than a man for any problems they have with their reproductive system!
B - not leaving ttc until 30's. Fertility can decline at an alarming rate at this point and that's just ttc, doesn't inc issues like mc or increased risk of genetic issues.
Following update re beans on toast/long chat, that's an improvement but you need a proper commitment from him, and yes I'd instigate a deadline - and less than 3 years too. Both for marriage and a baby. Getting married needn't be at all expensive or require a lot of planning. Decision time for your fiancé.
"Look, I'm old enough to have learned this: when a man wants to get married and have kids, he doesn't dick around waiting for years and years" I'm 46 and totally agree, seen friends/relatives/acquaintances strung along and end up either having to go through Ivf/mc etc or end up without children when they wanted them and the relationships then broke down anyway due to built up resentment - only for the man to quickly marry and have DC with new wife!
I'm also thinking he's been your one and only serious relationship? Personally I think people need more experience of relationships than that usually. Yes it works for some (I have an uncle who married high school sweetheart and they're still happily married 40+ years later) but it's VERY rare. Not least because we change a LOT in our 20's/30's.
What experience of relationships did you have before him? What about him before you?