Spoilers and my own understanding of the story.

Spoilers and my own understanding of the story.
To put it simply... the ex is SCUM.
Spoilers.
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In the next few chapters, amny things will change such as Max starting to accept he is atracted to FL, Fls father quickly catching on to this and more BS from the ex.

Fl Ends up not chosing an escort for the banquit. She arives instead with her father as her escort amd they wear matching white cloths with blue ribons and jewels. (father wears the cuffs FL gave him).
When they walk in everyone is captivated by their beauty but also confused, because of the rumor ppl thought she would bring her Lover but she brought her father. Ppl start gosiping that maybe its a distraction, so Fl's father (bless the man) werry flashingly adjusts his colar witch gives everyone a nice view of the rumored Cufflings on his sleave!
Quickly the nobels go "ah it was for her father, shouldnt have belived the rumors", also the nobel lady Fl exchnaged leaters with runs over exstatic. Fl gives her her gift (a custim made hand carved powder, with atached mirror), lla the ladies are stunde by the gift and go "where did you buy that". Fl goes "of i coundlt find a suitable gift for you so i had it custimmade, its the only of its kind in the world!". The ladies all think "shes a saint, no shes an angel!".

Meanwhile the ex now knowing there was no other man... gets happy with a dispicable grin and tries to aproach FL and her father. But Fls dad gives him the most meneching "il kill you" glare as he wlaks past, this causes ex to frieze in place and think "didnt he hate his daughter?!?!?" (shocked pickachu face).

Fl goes outside to get fresh air and cries a bit (happy tears, all the nobelladies like her and are nice to her). Max jumps out of a tree and asks what panned, she says nithing is wrong and he asks her to dance to chear hjer up. They dance in the garden, but their silousets can be seen though the stainedglass. Fl's father comes out and finds Max dancing with his daughter. Fl and max stop danching after heraing a glass breaking sound, only to see Fl's father standing with glass pieces in his left hand glaring at Max (he crushed his wine-glass when he was max smiling at his daughter).
Fl runs over and asks dad what happends and worries if his hand is injured and dad reasures her he is fine. HE still glares at max when FL isnt looking :P (if looks could kill, max would have been gutted)

My own thoughts.
The father is so cute as the story progresses, Fl starts to undertsand that he realy cares but still thinks he is trying to marry her off. Tho i belive she now knows its isnt to get rid of her.

Max realizes he likes fl, but had to find away around Fl's dad :P.

The nobel laides only disliked FL because she was hostile twards them (her fearing they would steal the ex). They all fall for Fl and even sees her as a Saint and Angel later on :P

The ex is trash or worse... He is angry that FL isnt answering his letters, that she wont see him and that she may be seeing a new man.. "you said you would love me forever! il make you pay".. He planed to hurt FL because of the rumor, but when he found it was fake he planed to aproach FL and use her. Lucky Fathergave him the death glare!

My speculations on the Ex.
Just my speculations, but it seems to me the ex was the one who poisoned the Princess to get frame FL. (He is a cunt after all.. he asked her to never apear infront of him nor contact him after she broke up, yet is pissed she followed through on her promise!).
It Seems to me the ex was with FL because he wanted the suport of her father, and with that suport he was able to become a royal knight and get close to the princess. Hence why he dumped FL, but dumping her wanst enough he wanted to destory her world, so he fraimed her and had her experience being abandoned by her father.
In the curent timeline the reaosn the ex was ok with breaking up with FL was because he thought Fl's father would still suport him, but that wasnt the case. Turnes out the reaosn the father suported him was because FL liked him :P. Hench he cant become a palace knight and get close to the princess in this lifetime :P

Also in the last life, Max may have been sent to the shadow room by FL's father to get her out under the guise of "torture", after all Max dosnt like his family so why would he care if FL had poisoned his "Sister".