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Good evening, welcome to just answer. I am a solicitor and reviewing your question now for you. I shouln't be long.
Thank you for your patience. You should apply for settled status based on retained rights of residence if you have separated now. Any follow up please do not hesitate to send your message. All the best.
You had leave to be in the UK based on her as her her extended family member though did you not? You couldn't secure that now if it was your first time.