My boyfriend doesn’t want biological kids but would adopt?

From the beginning my boyfriend always said he doesn’t want to get married and he doesn’t want to have kids. Two years later he’s saying (since I brought up the idea of adoption) he wouldn’t mind adopting. He also said he wouldn’t mind dating a woman who already had kids. I honestly don’t understand what the difference is between adopting, dating a woman with kids and having your own. He says he would treat them as if they are his but doesn’t want his own. Can someone please explain this to me because obviously he can’t.
My boyfriend doesn’t want biological kids but would adopt?
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