This shows that he is starting to loose interest in you. So be prepared now, he will soon breakoff with you.
There is nothing much you can do actually. When a guy have interest with a gal (so call love), he will do anything to make it work (you dont talk, he will talk, etc etc). When he lost that interest, even you become very talkative (or whatever) wont bring him back. Your change will only speed up his desire to leave.
The reason why he still looks at you... I guess its just a sense of guilty feeling and questions in his mind that makes him do that.
He looks at you and feel guilty of saying he want to breakup with you when you have not done anything wrongful (its just that he dont have that "love" for you anymore).
He looks at you and question himself... "am I going to just get stuck with you or find another one that give me back those loving feelings"... "why did I even started with this girl? why?"
You can disagree with me on the above. No problem to me. But on the safe side, you be mentally prepared for that day to come. Part with him graciously and let him see you standing strong (will give a good impression/memory to him so that he can regret next time when his romance with another girl failed). Open up your eyes now for start noticing those secret admirers of yours.