Te/Ti, Me/Mi, Se/Si of Spanish and Italian
I've noticed an interesting phenomenon in Spanish and Italian -- when it's 'te' in Spanish, it's 'ti' in Italian and vice versa, like Spanish "Te Amo" vs Italian "Ti Amo" and Spanish A ti vs Italian A te. This is the same for 'me' and 'mi', "a mi" in Spanish and "a me" in Italian. The Spanish say "me interesa" and the Italians say "m'interessa" (from mi interessa). Then also for 'si' and 'se', the Spanish say "como se dice" and the Italians say come "si dice." The Spanish say 'si' for if and the italians 'se'.
It seems like there is a pattern of 'e' and 'i' in Italian and Spanish, like when it's 'i' in Spanish it's 'e' in Italian and vice versa.
Can you explain this pattern to me? I'm sure it has to do with how they evolved from Latin.
(Transferred from old LINGUIST List Ask-a-Linguist site)