Why does he want to live together before marriage?

I went on a date with a guy and he said something that seems a bit strange to me. To give some context, we're both religious and so I presume we will wait until marriage to live together. We agree thay we shouldn't move in or sleep over before being engaged. But he said that he doesn't see the issue after engagement even if it's 3 months before the wedding. Why is he so adamant about moving in together during engagement but before marriage?
Why does he want to live together before marriage?
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