How do you let go of someone, you thought you'd spend your forever with?

I want kids.
He doesn't know if he ever will.
If he doesn't it's a deal breaker.
I've waited 3 years now. And I don't wanna wait forever just to be told "I don't want kids for sure."
And I don't believe in that "you're young, it's too soon 3 years isn't long enough bullshit" I could die any minute. And I'm not looking to waste time. I wanna achieve my goals in life.

But even though it's a deal breaker. I love him a lot and I don't wanna let go. I'm almost willing to chance it due to my feelings for him.

Tips? Help. Don't come in here bashing like I got enough shit to deal with.
How do you let go of someone, you thought you'd spend your forever with?
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