When is a good time to tell a boyfriend I'm not interested in having kids out of wedlock?

We've been dating for 1.5 year (but live separately; I actually prefer my house over his) and haven't really had a conversation about how to raise kids until he recently mentioned about having kids in a long-term relationship. I found this kind of offensive but didn't say much.

What if I'm not interested in bearing him any kids as just a girlfriend nor in doing this ''co-parenting'' new trend? I'm ok with a long-term relationship (if you're not ready for kids nor want any) and not into religion but having kids is something different to me. I actually would like to raise kids in a marriage, not in a relationship.

When is a good time to tell a boyfriend I'm not interested in having kids out of wedlock?
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