No, no, some of you all don't understand and are trying to undermine what that Miraxus interaction meant.
Laxus, 1 year after his insurgency and very much still butthurt, stubborn, grumbly and proud, is letting Mirajane in on feeling like shit for his past, not just with few words, but by letting her in when he's sulking in his corner. Because she knows him. Because, to him, she obviously is safe. Mirajane is also not worried about overstepping, nor is she impatient with him, because she knows him well enough to find the right words to pull a smile from him.
Not only is Laxus smiling a rare sight itself, but that shit is emotional vulnerability for the Laxus of this timeline. 100 year quest Laxus is softer, he grew out of his hatred and redeemed himself, but the one from Re:Fantasia hasn't yet.
Maybe Mirajane isn't his final choice, maybe they are not endgame (though I doubt it but that's for another post), but as of now, she is safer than some other characters, she is someone familiar he's known for a while, and she's someone who will continuously enable him to be kind, open, and self-forgiving.