I almost always subscribe to the idea that finding out (and communicating) is better than wondering endlessly, second guessing yourself (and him), and waiting for him to act. Closure is pretty important for peace of mind. There is nothing wrong with sending him a last (or maybe not last) message. Assuming that you can tell what is going on with him is a mistake. So ask and let him tell you.
Don't assume either that he will not tell you the truth. If he does not respond to your last message, you will have your answer. If he does respond, communicate clearly without being pushy. You have then given him a fair chance, even if the final result is that it is unlikely to work between you.