In need of serious advice... Boyfriend decided he doesn't want kids?

Jaclyn
edit: sorry if this is long but I really really need advice. Thanks for taking the time to read this. 
Hey guys. My boyfriend and I have been together for 3 years and I love him with all my heart. He was my first love, my first everything. I am 21 and he is 24. We always talk about our future and plan on getting married and i can really imagine myself growing old with him. We live together and spend every day together and I wouldn't want it any other way!
However we've run into a huge issue. He's always been indecisive on whether or not he wants kids. I've always wanted kids, and recently my cousin had a baby and it made me want to be a mother one day even more! I cannot wait to experience pregnancy and motherhood. However when I brought this up to him last night he told me he didn't think he would ever want kids... And that I shouldn't be with him in hopes that he changes his mind. 
I am so heartbroken. I so badly wanted to be with him and have kids with him one day. I now feel like saying what's the point? I have no idea what to do. Leaving him would be the most difficult thing ever but I don't think I could live a childless life.... Any advice would be greatly appreciated as I'm at a lost... 
Thanks guys ❤️

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