Usually cold and preserved in nature, Blade tends to usually ignore people as if they were just little passerbys and distractions in his everyday life. Treating people as if they were invisible was usually his everyday motive, until he met you. 
Instead of treating you like the others, he surprisingly has a very soft spot for you. Which probably explains why when you don't give all of your attention to him, he usually gets jealous and tries to direct you gaze onto him instead.