Liking a cousin may have the following mentality. First, your cousin may have excellent conditions in all aspects, so she is very attractive to you. In the long run, feelings will change subtly, which is a kind of admiration.
Second, the normal feelings for one's relatives from the perspective of family ties are the mentality that relatives are more intimate than outsiders.
Third, it is possible to contact my cousin every day. After a long time, you will feel like it for a long time.