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it's like, Lou is talking to his younger self, telling him there's no point caring or speaking up against the fact that he's not allowed to show who he is openly. That he's not the first or the last who's going to have to hide who they really are just because of how messed up the industry is. And caring only kills love could mean caring about what the management or the other people say too much will only kill your love with the person you're in a relationship with (this could be what happened with Larry : Lou might have wanted to hide everything a little too much and Harry must've have walked away - like Lou says in his song, the day you walked away is the day I became the man that I am now; and like how Haz says in Golden, the other person is scared of being open because hearts get broken), and a kiss won't bring it back, which is pretty obvious.
There's nothing left to say since people have already said whatever there is to say and still nothing has changed - the industry is still the same, homophobia and the glass closet is still the same. So hush your crying, dry your tears, it's not going to make a change, it's not going to make an impact. Your broken heart is a copy of the broken heart of someone else and so on and on.
(I'm not talking about the glass and birds ka theory because people have already theorised that - the glass closet and the birds are the people, maybe Haz and Lou, or maybe every single person who had to hide who their truly were)
Spilt blood could be Louis actually believing everything their management told them, and the loss they had to face, all the pain they had to go through because they couldn't speak up or change anything. So there's no use in crying over all that - like he says in Too Young, he gives in to the pressure, he thought that a love like this would never last - and we can actually see parellels and connections to his other songs, his album and him, as an individual.
Like, damn, Louis Tomlinson is a goddamn genius and anyone who doesn't see this, see how much hurt he had to go through is a fool.