My BF can't have kids??

I've been with this guy for 3 years, I'm 23. He got a physical recently & the doctor referred him to someone to get his balls checked out for possible infertility. (I'm on birth control so we've never had any pregnancy type things come up)

How would y'all feel if your bf couldn't have kids? But you've wanted kids all of your life & definitely still want to have them??