Firestar is in Krakoa now, a romance between them would be complicated 'cause of editorial lol.
Peter wasn't really happy that Kaine returned and even says he's a piece of **** when Kaine was just trying to run from the Kravinovs while leaving the other Spiders to die back in Grim Hunt.
Peter was willing to give Ben chances until Ben thought it'd be a great idea to kill everyone on the planet and then clone then in Clone Conspiracy.
He gave Ben a chance and then Ben went the super-villain route, so Peter not treating his as such would be insane.
Worth pointing out he lost the "Spider-Otto" memories, but he should still remember Ben since he saw him in that clone of his original body.