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Your card is not expired, but it is no longer valid. From The Immigration (European Economic Area) Regulations 2016, as amended, section 18 (Issue of residence card):
(7) A residence cardβ
...
(c) is no longer valid if the holder ceases to have a right to reside under these Regulations;
Therefore, you may not use your UK residence card, and to travel to the UK without your spouse, you must get a visa.