They realized their friendship was important.
Meaning: This means that the cat and mouse understood that their friendship was special and worth keeping.
Choice of Words: Realized means to understand or become aware of something. Friendship means a relationship between people who like and trust each other. Important means significant or valuable. When you put them together, "realized their friendship was important" means that the cat and mouse understood that their friendship was valuable and worth preserving.
Alternative Expressions
Related Expressions