Thats such a hard decision and I think about that with all my babies. It depends on your schedule, for me i am in college and i started to study in my buns pens everyday and they love it and act like dogs and beg for everything I have. I used to only spend 1 hour a day with them and it made me upset too thinking they are depressed but if you can, try and bond him with your puppy but remember to separate them when you’re not home so no one gets hurt. But try and see if you can do that and see if that means you can spend more time with him.
You can always get him a girlfriend( of course both fixed) so that they can be with each other all day and then you see them when you’re home. I know my buns, they like to ignore me all the time so it feels even if i spend hours with them, it feels like 5 minutes of interaction haha. Try everything you can and if you still think its not enough time, then research and find the best rabbit experienced household to give him to and you’ll know you did everything you could.