Totally agree with Tumbit’s advice above, you have to get YOUR reasons in order, and be clear about your priorities for this move - you can’t do it for your partner, or not do it for your relations. What do YOU want? Also, work through the practicalities as regards your business - you won’t find generating any new income in Spain easy, and if your business relies on posting stuff then costs will increase from Spain (though if you’re drop-shipping it may be fine).
Lots of people do find their quality of life improves and stress decreases when they move to Spain, but those factors depend on contented relationships and a reliable income - they’re not automatic. A trial period, renting both ends, is very wise advice!
Good luck and keep in touch,
BDP x