Sometimes I think he will, but sometimes I think that'd be too repetitive so they writers will choose to avoid that.

I think this is what the whole story has been leading to. He is the Dark, Rey is the light and when they join together they will bring balance to the force. In some way I hope that they become a couple because if all this. It's been quite evident that Kylo Ren/Ben has had feelings for her since they met. And in some way she became aware of her own feelings in TLJ. It won't be easy but I believe that this will be the ultimate climax of Ep IX. Ben Solo's Redemption.

I thought he was going to in The Last Jedi when he helped Rey kill Snoke, and his guards. I see two possibilities here. One where he dies, not returning to the light, and one where he does return to the light, then sacrifices himself to destroy something powerful from The First Order.