There are several defensible pronunciations of Latin - the most important consideration is to be consistent in whichever pronunciation you choose.
The standard current Anglophone pronunciation of fides is almost FEE-DAYS (though the vowels are clear continental vowels, without the typical English glide).
The Latin word for believe is credo, credere. We get the word "credit" from it.
Fides.
Fides.
'Fides quod fides' is the phrase. Fides means both trust and faith.
Fides.
Fides (genitive: fidei, f).
Fides et amor.
Fides (genitive: fidei, f).
Fides, familia, amici.
The Latin root of "fidelity" is fides, trust, belief, faith.
'Fides et...' would be 'faith and...', but 'auber' does not appear in the major Latin dictionaries.
Fides is the Latin word for faith, fide would be the ablative case, meaning "by faith"