I tried to slip an "I love you" casually into my last email to my cousin a bit back. He'll probably see it as "family love", unless he's on to me. I'd have said it more if I wasn't so chicken when it came to telling him how I feel.
I personally don't think you ever really get over your cousin love. Maybe it's the family bond, maybe it's something else. For me, there's a 99% chance I won't ever get to be with my cousin, but I know that there is always going to be a part of me that still loves him, even if I end up with someone else. The bond with him goes deep for me, and as my father is wont to say "blood is thicker than water".