"You're loyal" is an English equivalent of the Italian phrase Sei fida. The present indicative in the second person informal singular and the feminine singular adjective also may be translated into English as "You're devoted" and "You're faithful" according to context. The pronunciation will be "SEH-ee FEE-da" in Italian.
Chi sei? in Italian is "Who are you?" in English.
Sei bravo! in Italian means "You're good" in English.
Sei bella! in Italian means "You're beautiful!" in English.
"Six" in English is sei in Italian.
sei li?
Tigrotta sei! in Italian means "You're a little tiger!" in English.
Perché sei arrabbiato? in Italian means "Why are you angry?" in English.
"Are you safe?" in English is Sei salvo? in Italian.
"You are horny!" in English is Sei arrapato! in Italian.
"You are special!" in English is Sei speciale! in Italian.
"You're in charge!" in English is Sei in carica! or Sei responsabile per...! in Italian.
Sei un cavallo! in Italian means "You're a horse!" in English.