so basically, harry died a year ago on christmas eve and louis has been really weird, has hallucinations and asks everyone where harry is and so on. so his mum sends him to a mental asylum and after eight days there, they declare him as not crazy. so he got happy because the day he was waiting for (christmas eve) had finally came and he got out a day before, so he took it as a sign. so he killed himself the day after (the same day as harry died a year ago) and came home to harry.
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hope this cleared everything !! personally, this book was rushed and shitty and unorganised and thats totally how i meant it to be. it was supposed to be that way, louis acting crazy in one second and okay in the asylum with lo (journal) and harry's note and he was just numb and all you know? and one day, they tell him he gets to go home. and he goes to harry.
thats exactly how it was supposed to end, like a spur of the moment when he read harry's note again and the fact that it was christmas eve and pictures of them in the wall. it all made sense to him, a way of harry telling him to come to him.
so he did.