No, Corey and Erin are not together.
After attempting to reconcile briefly following their reunion breakup, Erin Smith confirmed that she and Corey Sobcyzk ultimately could not make their relationship work. Despite their efforts, they have since gone their separate ways.
The journey of Corey and Erin, initially seen on Temptation Island, involved various ups and downs, including a period where they briefly got back together. However, this reconciliation proved to be temporary, leading to their final separation.