RadarOnline.com has revealed that it all came down to their careers, most specifically, Austin's.
According to an insider, "Austin’s career has really skyrocketed in the last year. He appeared in Once Upon A Time In Hollywood and he’s starring as Elvis [Presley] so for him, he is just focusing on that and it really impacted his relationship with Vanessa."
Ouch! Since Vanessa has been in the spotlight for the entirety of their relationship, that's gotta hurt.
What makes it even sadder is that the pair were planning on getting engaged not long before they split.
"They had talked about an engagement before they split up," a source told People.
As we know, that didn't go to plan. However, it doesn't mean things might not eventually work out for the former couple. Recently, sources revealed to E! News that they are "going to see what happens" in the future.