Original sentence: Originally, Mon-El claimed he was a bodyguard of the Daxamite prince, but after starting a relationship with Supergirl, he is revealed to be the prince himself.They continue to be hostile toward one another due to an ancient feud between the Kryptonians and Daxamites
Edited sentence: Originally, Mon-El claimed he was a bodyguard of the Daxamite prince, but after starting a relationship with Supergirl where he acts emotionally abusive, he is revealed to be the prince himself.They continue to be hostile toward one another due to an ancient feud between the Kryptonians and Daxamites (a planet feuding with Krypton because of Daxam's slavery and cruelty)