We still have an out stamp from Barcelona from Oct last year.
The bloke on the desk didn't even want to look at the TIE and I practiced in my best Spanglish as well.
We came back in Dec and they couldn't have cared less. Just waved me through, I did ask for an in but they didn't want to know.
Same on the ferry out and back in April..

Not surprising when you realise that Spain is the only country in the EU to have NOT expelled ONE British person for overstaying...
The whole freedom of movement thing is a farce. I have a British friend who is now a Portuguese resident but he lives in Spain.
Our French, Dutch and German neighbours are still non res and paying tax that way because they reckon they are better off.
None of their cars have Spanish plates either..

Oh well anyway that dont help the OP.
I would suggest you ask at immigration when you enter the country and then follow what they say. Or not. Its entirely up to you.
Lots of EU citizens are breaking their own rules but moan like mad when someone else does it..
Your other half has a Spanish passport so nobody will care how long they stay here and you shelter under that so have a nice time and dont worry.

My 2c which aint worth half that...

Section 6 of the Border Guards Handbook - "The travel document of family members of EU, EEA and CH citizens who are third-country nationals must also be stamped, unless they present a residence card issued in accordance with Directive 2004/38/ EC as submitted in line with Article 39 of the Schengen Border Code or otherwise clearly indicating a family member of an EU citizen or a family member of an EEA or CH citizen."