The Tagalog word for 'crush' is gusto. As a verb, it also means 'to like' and 'to want'.
May gusto ako sa iyo.
I have a crush on you.
Gusto kita.
I like you.
Gusto kita talaga.
I really like you.
Gustong-gusto kita.
I really, really like you.
May gusto ka ba sa akin?
Do you have a crush on me?
Gusto kitang makita.
I want to see you.
Gusto kitang makausap.
I want to be able to talk to you.
Gusto kitang makasama.
I want to be with you.
Masaya ako 'pag kasama ka.
I'm happy when I'm with you.
Palagi kitang iniisip.
I think of you all the time.