I'm obsessed with my cousin
Why are you obsessed with your cousin?
He is just so nice.
It's great to know nice people, but becoming obsessed over them, like your cousin, is damaging to you. Keep yourself in balance and don't let yourself go to extremes.
I don't care if it's extreme.
It's good that you like your cousin, but it's important to cultivate other relationships as well. It's better for you and your cousin as well.