Will a guy avoid you if he thinks you are developing stronger feelings for him?

if does not feel the same way then yes. it is probably because he does not want to hurt you or that he'll feel very comfortable around and that you may appear as more than a friend when he is going out with someone else. then again other times, no. because he may share the same feelings but doesnt know how to express them or he may just be greedy and use you as a back up if other relations fail.