Abort! Abort! You're headed straight for that Irony-berg! See, not responding to obvious hints is in fact the most often overlooked hint there is. If this guy's "somehow" not picking up the clues you're dropping, it might be time to question whether he's stepping gingerly around your offers of affection like so much dog turd. He may not be into you.
If your hints up to this point have been overly subtle, maybe he legitimately hasn't noticed any. There's one simple way to find out: give him a hint that can't be ignored. His face tattooed on your bicep usually works. If he still ignores you, you've got your answer.
Although more likely, you already know the answer on some level, and are asking me either to confirm or deny your own suspicions. If a guy isn't responding to your hints, there's a pretty simple reason why that most of us will ignore to spare our egos. Don't make that mistake, or you'll waste a lot of time and a lot of signals.