Star was never shown as a weakling or a traumatized person who'd gotten off an abusive relationship, it was always clear that she was very confident in being able to handle Tom. It's Marco, who'd never met him, who was getting all worked up, while Star, who actually knew him, had interacted with him and was his ex, who scoffed at Marco's worries and was quite cheerful and even excited about being his date in the ball because it sounded cool. >how Star immediately treated him
Star didn't treat him like a threatening or manipulative person, She didn't treat him like someone she's nervous around - she treated him like an ex who's still clinging on and harboring hope and gawd won't you just stop sending me gifts and asking me to things we broke up. She was very clearly frustrated by an annoying orbiter, not threatened. Sure she was worried - but only ever about Marco, who's a puny human and was running his mouth at the prince of the demons, but never about herself.
So no, it didn't.
Only people who idiotically clung to the "toxic, abusive relationship" headcanon wanted to see it that way.>or how Tom was going to kill Marco
If we're taking shit like that seriously, then considering Star's battle outfit, weapons and eager bloodlust in School Spirit, they're a great match with Tom. So again no, not abusive since obviously they both enjoy killing people who oppose them so they probaby went on romantic killing sprees together or some shit. (Obviously they didn't and it's all for comedy)