I reckon the house was the catalyst. (I mean it could’ve been anything and we’ll never know) but logically it would’ve made sense for them to have a discussion about the next chapter i.e. moving in together into the house. If he still wasn’t arsed, I can see how that might be the final straw for her.
Obvs just speculating, but it looks like she ended it, she was over it long before it ended (she doesn’t look to have gone through a horrific heartbroken period). She either has someone else lined up, or like I said, was over him long ago. I don’t blame her if the latter.
I’m happy for her! If only she’d show a fun carefree side and document getting back into dating etc. or generally just letting her hair down a bit. But that’s just not her is it?