How i do i get revenge on my bf who left me for his ex gf?

my bf left me for his ex gf, and using me financially. he told me he loves me and wanted to marry me and i can't believe he did this? how i do i get back at him? do you understand the betrayal and hurt i have? i trusted with him with all my heart. how do i get back at him? he hasn't called me for 5 days now and i didnt' call him. do i not call him? he doesn't even know what he did wrong. he told me he didn't do anything wrong.