If the coworker manages to break Tashiron up with the girlfriend and go out with her instead, there is the high possibility that the coworker will dump her once she's had her fun. The coworker seems like the type of person who is addicted to stealing cute girls from their partners and, once the thrill of "stealing her" is over, she will probably become disinterested in her and move on to a new victim. If the coworker does break up with Tashiron later, would you consider that a happy ending or bad ending?
If the coworker breaks up with Tashiron, then Tashiron will no longer be in a toxic relationship anymore and have the freedom to regain agency in her life. But then, Tashiron, who does not seem to have high-self esteem nor any friends or family to support her emotionally or financially, might become lonely and depressed. In addition, there might be a possibility that Tashiron will go back to her original girlfriend. Or if she doesn't go back to her girlfriend, there is also the possibility that she will find another girlfriend who mistreats her. Or maybe she will find a girlfriend who treats her right.
So then,
A) Tashiron is able to regain agency in her life and be happy
B) Tashiron will be lonely and miserable
C) Tashiron will go back to her original girlfriend
D) Tashiron will find another girlfriend who mistreats her.
E) Tashiron will find a girlfriend who treats her correctly.
Which possibility do you find the most likely and why? And which possibility do you find the find the least likely?
(Or you don't have to answer. I know it's weird asking a reading question for a yuri manga, but honestly I'm just curious what people might think.)
If she did happen to find an actual good person, they would most likely fall for her out of pity. In my opinion pity does not make a completely healthy relationship either. Seeing as Tashiron is someone who would rather hide her feelings and has no healthier way to overcome them other than over-drink or cheat, she will not be in a healthy relationship anytime soon...