Now if the author wants to salvage this arc, Chita will slowly find herself alone and unhappy because her friends have moved on with her life and she’s stuck thinking that her relationships with everybody will remain static for the rest of her life, and when she’s desperate for company and calls him up in 3 years because of how her life has turned out, he’s moved on and has a girlfriend he met in university who he’s happy with.
That’s where these actions lead. She still doesn’t have to date him, and she shouldn’t, but she should have by now figured out that nobody stays the same forever, and the more she pretends otherwise, the worse it will be for her.