Responses
This is my own thoughts and opinions, please don't really take it to heart to anyone who did since I posted this just to give my own two cent on this serie that I'm so looking forward to reading when it ends
Ur point 1,2,3,5 are right on spot. He was really shocked when he discovered when their parents got married, he could not marry minato, so he just kept his feeling a secret and swear to never marry anyone.
And funny when he actually in relief when minato becomes to hate men due to his womanizing behaviour.
--Tooru did like Minato when they were kids(like as in REALLY like>>(╯°Д °)╯╧╧<<this kind of like)
--Tooru became gloomy when their parents got married because of the strain of his feeling vs their family's happiness
--Tooru distanced himself because of the same strain that caused his gloominess
--Tooru made himself to seem like he doesn't like Minato so he can fool himself to believe the same
--Tooru fell in love with Mina because of 1.>her resemblance to Minato and 2.>Mina appears to behave candidly similar to when Minato was still a little girl when they still played together (I believe he did accept Mina and Minato as two separate person rather than him deceiving Minato to think so)
--I will not try to speculate how the ending will be here as I already had in my mind and will just look forward to be pleasantly surprised when it does truly end
PS
The title LIARXLIAR I believe is meant to represent the two characters' deceit that Minato played in the whole story though I think those two personality that she portrayed is her in the whole sense because her feelings for Tooru are actually genuine both as the girl who loves him and the sister who cares about him..