You can travel in and out of the UK as much as you like BEFORE you get married, but once you are married, you shouldn’t leave again until you have your FLR(M) visa, because you will no longer be a fiancé and may have issues getting back into the UK on a fiancé visa.
Once you have the FLR(M) you can travel in and out of the UK as much as you like, as long as the UK remains your main residence and you live with your spouse continuously.
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