My ex is *trying* to play games. ideas on putting him in his place?

We broke up two wks agobc this parents didnt like that he loved a white girl (theyre hindu) and hes being passive aggressive. We were texting earlier and he says,'gtg talk to u girls later' to which i lovingly replied, 'girls? Plural...?' And he told me he was also talking to a few girls ik are flirting with him. Our relationship was more than this... i dont deserve to feel like hell bc he wants me to. Im perfectly intent in playing games back but id like feedback. And ideas that wont jeopardize a future friendship with him or get me arrrested. Lol thx!