Yeah I would agree a little on his part forgiving her easily and still chasing her even after he found out that she used him to get revenge on her ex, but I still asked the same question why does the fl has zero dignity for chasing him and does that mean guys that chase women they like have zero dignity too
Nooo, you're right, nothing bad with chasing who you like/love regardless of the gender. Idk what the person you're replying to meant, but IMO, FL approched and chased after the ML for a fucked-up reason, so that's different. And it's not about dignity, it's just literally a shitty thing to do, to use others for your petty, juvenile revenge. FL is lucky that ML already had a crush on her befoe
characters can be complex. if people were perfect falling for each other for perfect reasons and perfectly get together, then stories wouldn't be interesting. her reason added a bit of drama and make the plot interesting by adding the conflict in the background and also getting a reason to explore other characters like his niece.
I agree the characters are rather one dimensional but what moral judgement are you giving to characters in a story that are meant to entertain audiences?
I totally agree with everything you said, but can we also agree that the FL's reason for approaching the ML is shitty? You don't need to be as extreme as a moral police to be able to see that? If it is the spice the author use to add drama to the story, it's all good, but it doesn't make it not shitty. It's not that deep, really.

Tho I've been wanting to read this for a while everyone seems to like it but...for some reason I can't seem to like the fl and bring myself to read it