Cancer men - I have a lot of them in my life (Dad, Brother, Dog, several ex boyfriends, a few friends).
I am also a Cancer female.
Moody, grumpy, bad communicators, selfish - very very selfish, even when they love you to the Moon and back they are selfish. You will never know what they are thinking unless you have grown up closely with them. They love sex - they don't deal well with their own emotions, have a tendency to shut down when confronted with others emotions and then on reflection are fine with it weeks later.
Of course, this is only the sun sign and there are so many combinations when you throw in the rising sign, moon sign, mars, venus.... etc.
However, I believe all stated above will be present in some dosage.
What does he want? He does not know. What he wants will change several times a day.
Is he toying with you? Not intentionally, in his mind no, he likely has feelings for you because if he didn't he wouldn't touch you with a ten foot pole. However, refer to the answer to question one. He does not know what he wants and he won't be forthcoming until he's decided.
Being a Cancer female, I can relate, I will withdraw into my little shell unless I am 100% confident or if it is something I can very little for. Usually it is easier for me to say no and deal with that consequence, than say yes to something that involves other people, other points of view, other considerations.