You can say:
Ya (sounds similar to the German word for yes, rhymes with the Russian word Da which means yes)
Teb-ya' (rhymes with Ya above, accent on the second syllable)
lyu-blyu' (long vowel pronunciation, accent on the second syllable)

Ya tebya lyublyu.

Ya lyublyu tebya means the same thing. Russian, like many European languages but not English, changes word endings as the word is used, so you can pretty much scramble the words in a sentence of Russian and the meaning is not lost. Which brings me to the observation:

You can also sing or say: "lyublyu tebya" (or tebya lyublyu") and leave out the 'ya' because the form of the word 'lyublyu' implies the 'ya'