If it’s a non negotiable for you, and for him, then you have to end it. With love and friendship. Maybe some couple counselling to help unpick it to be sure that it’s a true non negotiable for him. Having kids is an enormous commitment and demand on your body, time, career, finances, and lifestyle. It’s your prerogative to choose. And having a baby to please someone else or fulfill someone else’s dream is a sure fire way to kill a relationship in a much more awful way. And as gut wrenching as it is, staying with someone hoping they’ll change their mind about kids is also a dead end. You both live for decades on end as seperate ship in the night, passing each other and hoping for a change of heart that will put you on the same course. You’re marriage hasn’t been as long as the future you are planning together. So he needs to truely accept THATS off the table for the marriage to succeed long term. It’s heartbreaking now, but it’s only 2 hearts being broken. Who are both young enough and probably cool enough to support each other in moving forward to chase the life they WANT. It’s hard, heartbreaking, painful... but if you aren’t on the same page, then it’s going to be all that, plus resentment. Good luck x