How do I pronounce "Kocham Ciebie"?
Well I haven't heard you, so I don't know.
Snark aside, no one says kocham ciebie, they say kocham cię "KOH-hahm chyeh"
The answer is "Ja ciebie też" (Yah CHYEH-byeh TESH, literally "I you too".
The ch in kocham is somewhere between ch in Bach (or loch) and English h in happy.
The vowels are like Spanish or Italian but -ie = ye (the y is pronounced together with the consonant in front of it).