Let me demonstrate the difference in the yummy way to help you understand.
Crush : It is like that costly cake in the bakery, you see that always but never get near it.
Like: It is like some random new dish, which caught your eyes for a while but then forget it all together.
Love: It is like that, favourite dish of your’s which awaits for you , and after seeing it you forget everything else (crush too)
Saranya 