I've been reading The "Odessey": The Zombies in Words and Images ever since I got it a few days ago. It's been really interesting seeing the hand-written lyrics (not only for seeing what the Zombies' handwriting looks like but also because of the authority that these transcriptions have), and while looking at the lyrics of "I Love You," I discovered something really clever.
The verses end with the lines "But something holds me back / When I try to tell you." Semantically, it could end there, but it also makes sense as an uninterrupted thought continuing into the chorus: "But something holds me back / When I try to tell you // I love you, I love you..."
The song starts with the chorus, so initially those "I love you"s stand independently, but when the chorus follows a verse, they could also be the direct object of "tell" in "When I try to tell you."
