If you are not married or in a civil partnership, then you can end your relationship with your partner without any need to apply to the courts.
There is no such thing as "common law marriage", and you have no rights in respect of finances apart from the rights that any two people might have if, for instance, they bought a flat together and were sharing it as friends.
This is a very complex area of law, that requires specialist advice, especially if you or your partner own a property or have any other sorts of assets. If you need advice about your family finances, we can help.
If you have children together, then the situation is much more similar to that of a married couple or a couple in a civil partnership who end their relationship.
If you are unsure about whether you want to end your relationship, we can discuss that, and maybe talk about counselling and therapy. You can contact Nicola Harmon to discuss this further