Cohabiting? Wake up sucker! There is no such thing as a common law marriage.
It doesn't matter if you have spent your entire life together or two weeks, in England and Wales if you are unmarried nor a civil partnership your legal rights in a break up are ZIP
“To many family lawyers’ disappointment, the King’s Speech on 17 July did not include cohabitation law reform in Labour’s upcoming legislative programme. With estimates that there are now around 3.6 million couples living together outside of marriage or civil partnership in the UK, it is increasingly clear that the current law is not fit for purpose.” Stewarts Law blog post, 14 October 2021