Husband is afraid of ejaculating inside me

My husband has finally agreed that he is ready to start trying to conceive, but there’s one very important issue- he apparently is afraid of actually ejaculating inside me. The first time we had sex after agreeing to try, he asked for a condom. I was obviously confused, and finally he opened up. I don’t know if he’s actually just still not ready for kids, but has anyone else’s partner had this issue? How did you get through it?