It just goes to show how much of a false image influencers portray online, even in vlogs. I think most of us agree that they didn't seem suited as a couple, but all she ever showed was them having a laugh and being really happy together. You don't just breakup over night, this will have been brewing for a while, yet she still made a point of including clips in the vlogs of them together right up to the end.
So of course it will be a shock to her regular viewers when he's been in nearly every vlog for about a year then suddenly he's not. I can't imagine going through a break-up publicly but that's the career she chose, and if she chose to include Tim in the vlogs then people are going to wonder where he's gone. As someone said above, you can't just have the positive aspects of being in the spotlight, you have to take the negatives that come with that too.