I trust you.
mi FI-do di te — stress on 'fi-'. 'Fido' is from 'fidarsi' — two syllables: FI-do.
A fundamental expression of trust — simple, direct, and one of the most important things in any relationship.
'Mi fido di te' = I trust you (reflexive 'fidarsi di' + pronoun). 'Fidarsi' = to trust. The reflexive construction — I trust myself to you — implies active, personal commitment of trust. It is not passive but chosen.
Posso contare su di te.
I can count on you.
Trust expressed as reliability — you will be there when needed
Non ho dubbi su di te.
I have no doubts about you.
Absence of doubt as the positive expression of trust
Sei la persona di cui mi fido di più al mondo.
You are the person I trust most in the world.
Superlative trust — above all others
Trust ('fiducia') is one of the most valued qualities in Italian relationships. Italy's social structure has historically been built on networks of trust — family, friends, community. In romantic relationships, 'mi fido di te' is not just a feeling but a social contract, and it is treated with great seriousness.