Curate, connect, and discover
Okay so I've seen multiple posts about how Logan wanted to save Wade bc of Love and I really appreciate it but I have to be the bad guy and at least bring another option in the ring:
Logan is completely depressed for ages, haunted by voices of his family and closest friends he "let die". He hasn't slept well in ages and is an absolute alcoholic to be able to just get through the day. He has no friends or even a single soul who is simply friendly to him.
Logan wants to die.
But Logan can't die.
So of course Wade is the person to change all that and bring light and hope into his life and he definitely did want to save him for Wades family - bc he still believes he has nothing to go back for and if Wade dies he is back where he started and he just doesn't want that. Nobody wants that.
So he has two options, since both of them believe this is the end either way:
Let Wade die alone (with the risk he may not be able to stop it, despite the fact he didn't even reach it alone but let's be honest he hammered against the door before he could even see that)
OR
Die with him - bc he wants to swap places with him / he has to be the one who dies / he'd rather tried than do nothing or run away like always /
This is his only chance.
Seriously. He's been alive for so so long. He's through so much and he knows if it goes bad he HAS to live forever and most people know that's more like a curse than a blessing. He has the chance to end all that. To choose right then and there. And he made that decision.