It is hinted in the series that he may have a possible crush on Juliet. As when he finally came face-to-face with Montague instead of killing him, after almost a lifetime of hating him, he controlled his anger (not an easy task either) and instead asked him how to save Juliet. He is also shown to have concern for her well being, but the feelings appear to be more than just that of friendship. This is shown when Juliet admits to him that she is going to die to save the world. As she leaves he calls out to her as if he is struggling to say something else.