POSSIBLE MEANINGS?

So this man that i've been talking to more than 2 weeks we been pretty serious and then he started sendinf green hearts, so i asked him asking if he's freiendzoning me or like whats up cuz he used to always send red hearts, well both actually, then he said "noooo why would i do that, i got my own special meaning for it" me: whats it mean and is it bad him: "obviously not"

any ideas that may poppin into peoples head what it could bee???? he's telling me he's not ready to tell me yet