Getting a mortgage with someone with a lower credit score.?

My fiance and I are planning to buy a home together before we’re married. My Credit Score is 885, but he foreclosed on a mortgage 4 years ago and at last check he was in the 600’s. We would need our combined income to afford the house we want. Would our credit scores get averaged together? Will having a mortgage with someone with a low score effect my score?
I thought 885 was a little high too, but I got it through Experian Vantage Score and they list the scores as 501-990.

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