Posted: Mon Jul 12, 2021 11:06am
As far as I'm aware, you should be fine. You have the legal right under EU Human Rights laws to reside with your partner as a family member, married or not.
In UK, when in the EU and under EU immigration laws, the partner with this right to remain and reside with their EU partner/family member can access health services etc, but the EU member partner has to prove that they have sufficient income to support you in order for you to get residency.
Assume it will work the same in Spain as an EU member state.
May be helpful to engage a gestor to sort the paperwork make enquiries and residency application for you.
I can recommend Agencia Tallero in Platja D'Aro. They are accountants, but sorted all my paperwork. Spanish driving licence, residency, setting up as self-employed (autonomo) etc
They don't speak perfect English, but are well-established, very helpful and professional. Will bill you for their services of course. But have never billed me just for advice as many do here.
Hope this helps