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Once you are married your husband will have Matrimonial Home rights - the right to live in the property so long as you are married.
The longer your relationship lasts the more likely it is that he will acquire a financial interest in the property - although it will be many years before it is a half share or anything close
If you wish to ensure that he does not acquire an interest then you can both sign a POST nuptial agreement setting your agreement out.
Please ask if you need further details