I hope he says it. Please Jian Yi: confess! you'll feel vulnerable and afraid, but it will be for the best, and your friend will understand you better. he sould be direct and clear. XiXi is dense and untactful, but these things (feelings) should be expressed by words too. we can't wait people would read our mind nor guess by our actions how we feel (because sometimes our actions don't show the intensity of our feelings or even contradict them)
I still think he should talk about his feelings... maybe not say "I love only you" but be honest

Can I have a "i love only you zheng xi" ??????ლ(´ڡ`ლ)