Okay, I am going to be completely HONEST with you, as a Cancer myself and as someone who knows many cancer men (some of them my close friends, relatives and family.)
Well, my friends always thought that this one guy (who is a cancer and now one of my good friends) used to like me. They used to be like, "he stares at you all the time," he even wanted to spend time with me all the time (and that too alone), he liked hanging out with me, he was shy and would run away when he saw me, he would stutter, he would be at a loss for words at times. My friends were hell bent on setting me up with him, but me being a cancer, i wasn't so sure he liked me (and I sort of liked him, but not really.)
Reason 1- He stares ALOT: Trust me, my cancer guy, STARED like there was no tomorrow and he would never see me again. This is JUST HOW CANCERS ARE. Every cancer I know (including me) are observant to the tee. We love looking at people, their reactions and we generally like eye contact. I think that is part of the reason we are called intuitive, all we do is stare at times. Sometimes we would much rather be silent and figure the person out through action and not through speech, hence, we stare.
Reason 2- He is shy: We all are, sorry to break it to you. We get very shy, especially if we find someone attractive, BUT THAT DOESN'T MEAN we like them. Cancers, I find, can find so many ppl attractive and that can keep us shy and held back for A VERY LONG TIME. But for us, if were not emotionally attached, their just nice to look at, but doesn't mean we want to be with them.
Reason 3- He stutters, runs away: Cancer men tend to have a lot of pride and are sensitive, public image for them is key! Even in front of ppl they have known for a long time. Remember this, he could just be stuttering because he wants you to know the real him. He wants you to have a good impression of him.
Basically end of my cancer story, one of my friends just asked him and he said "shes a cool person, but I don't see her like that." We became good friends after that and I saw him in action with other girls. If a Cancer man wanted you, he would SHOW you. Its simple as pie, they will run after you, try to get your email/phone number on the sly. They will not play too many mind games when they like you. My guy also used to be protective of me, and that is another reason the girls thought he liked me, when another guy came up to me etc. That is just a Cancer protective nature, especially towards those they want to be friends with.
KEY: DO NOT MISTAKE A CANCER LIKING YOU WHEN THEY WANT TO BE GOOD FRIENDS. Cancers seek depth and emotion everywhere, even in FRIENDSHIP! They want a person who understands them and make sure they are life long. Does not mean they like you.
SORRY if i was harsh, hope it helped.
p.s. if you still want to pursue it, tell him straight up. Trust me its the only way, if his answer is silence of i dont know, and he dissapears- he doesn't like you. Cancer, if they do like you, will run to the chance to be with you, if you tell and he says he likes you back- then you have an answer.