Figure out who wrote each "Two truths and a Lie," and then match that handwriting to the handwriting on the "Never Have I Ever" notes.

This note can be decrypted by referencing the playing cards photograph. This photograph shows that different heart and diamond cards map to different letters in the alphabet.

Start by mapping ace of hearts to the letter A, then map the next letter of the alphabet to the first diamond card (i.e. ace of diamonds). Alternate between hearts and diamonds to map the rest of the alphabet (i.e. 2 of hearts maps to C, 2 of diamonds maps to D, 3 of hearts maps to E, 3 of diamonds maps to F etc.)

Decrypted, the note reads:

HES A LIAR AND A BACKSTABBER. WONT OWN UP. ILL MAKE HIM FEEL AS HELPLESS AS HE MADE ME.