Oh gosh this is a hard question XD I think it'd be great to see them together again, but it did feel kinda forced in a way? But like you mentioned in one answer, not all things do work out in the end, so it would make sense if they didn't (But they're kinda cute together)
I might say just let them stay appart, at the least for a while. I agree with what radiiiance said, they did feel a lot like they could just be "Super cool almost-brothers"
I feel like they need more time, I kinda felt like their relationship was a bit forced at first so when they broke up, it feel...more normal? Didn't Null feel more like friends the whole time anyway? They feel like super cool almost-brothers. Also I can't see Null crawling back to Oliver or Oliver begging for a second chance, he was pretty upset.
I am torn, because that would be cool to have them back together, but it is always cool to have relatable stuff too. Some people like simple and happy, since it's a break from real world stuff. Others like things they can identify with. I'm one of those darn people that want both. lmao
They could always be one of those couples that were together, split because that's what they thought were best(and maybe it was at the time to have growth) and then later in life find each other and fall all over again.