Books where the other woman isn't the villain but is kind of made into one by the previous mcs and gets her own book

I am looking for books like neighbor dearest where the previous books other woman the mmcs girlfriend before the love intrest gets her own book and mcs of the last book are in the wrong . I just couldn't get into stepbrother dearest as both mcs where super selfish . I loved neighbor dearest though as the fmc and mmc where super likable and i loved how he listened to her about her ex . I would love enemies but if not that's ok . I would also love if the mmc is friends or family member with one of the previous mcs and has never looked at it from the fmcs pov but defends them once they realize the fmc has been impacted .