LDR texting

I am in a LDR with my boyfriend and at first everything was amazing and great and he sent me really cute messages and he really cared
but we got in a small fight, and we got over it but now he texts very differently, using less words, just sending hearts instead of talking
and it's starting to worry me. It gets awkward when we text and i don't know what to say anymore/ talk about anymore.
He says he still loves me and everything is great when we voice call each other, but when we text its dull and not as fun as it used to be.
did i do anything wrong? should I be worried?