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I am afraid you can only apply for ILR 28 days before your visa expired in June 2020.
One of the conditions of your visa is that you must be living together in the household as a couple and if your marriage breaks down before you are granted ILR, there is a risk that your visa will be revoked and you will have to leave the UK.
If possible, you should try and stay married and remain as a couple until you receive ILR as once you receive ILR, you may immediately apply for British Citizenship if you so wish.
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