I'm going to watch an anticipated film with my cousin instead of my friend
Why are you watching with your cousin?
My friend couldn't watch at the same time I wanted to.
It is unfortunate your friend could not make it, but that happens sometimes. You are free to watch it when you want to.
I had to see it, I am really looking forward to this movie.
That is understandable. Maybe you can see it with your friend at a later future date anyway, if you like it enough.