I don't think Curtis is actually doing anything wrong at the moment, I think he's made it clear to both he's going to get to know them both. Surely it's far too early to commit to just one of them. He made that mistake already jumping in with Amy!
Do agree his bold actions gives rewards statement was cringe though 🙈
If he has zero interest in Maura then yes he's stringing her along but I expect producers have some involvement with that.