why am I sad?

Hello, my fiancé and I wanted kids for 2 years and we were TTC
and now he's like " I don't want kids now anymore"
Why am I hurt? Why do I feel like he doesn't love me anymore? 
I can't stop crying. 
He's 24 and I'm 24 soon too. 
What am I supposed to do?
He's like he doesn't want to have sex anymore in case I get pregnant :(