I don't understand why Chris is single if he is. Are all gay guys blind or something? Chris is amazing! But to answer your other question, I think his future boyfreind or whatever would be jealous of the fact that his onscreen boyfriend is Darren Criss. They also appear to be quite close, just saying.
Chris is single. Although, crazed fans, including myself, all say the he an Darren are darting in real life. However that's is 99% not true. I struggle to keep that 1% chance of their relationship alive, though.