And apparently Jacob isn't quite over it either - based on his latest Tweets.
The YouTuber wrote: "u stay on my mind," and fans couldn't help but wonder if the tweet was aimed at his ex.
We're not exactly sure it's the best way to get Millie's attn tbh - the Stranger Things actress deactivated her Twitter account after people started making up fake stories about her with the hashtag #TakeDownMillieBobbyBrown.
Ugh, the internet can be the worst sometimes.
Jacob and MBB split up last week after seven months of dating.
They both announced the news of their split on Instagram stories with near-identical explanations for their break-up.
"The decision with Jacob and I was completely mutual. We are both happy and remaining friends," said MBB.
Jacob wrote: "The decision w mills and I was completely mutual. We are both happy and remaining friends."
Could a reunion be on the cards for these crazy kids?