Life comes at you fast.

Just ask Mac Miller. 

It wasn't so long ago that he was dating pop princess Ariana Grande. But they announced their split a month ago. Days after that, Miller was arrested for Hit and Run and DUI. Then Grande branded their failed relationship "toxic" and revealed Miller has drug and alcohol issues.

Grande quickly rebounded with Saturday Night Live funnyman Pete Davidson. Even though the 24-year olds have only been dating for a matter of weeks they just got engaged.

How's Miller taking that? According to This Hollywood Life, not well.

"He is still broken hearted over their split and he can’t imagine how she could move on so quickly, or fall in love already," their source said. "It hurts Mac to think Ariana is considering marrying someone she barely knows. Mac loved Ariana for years, and it is like a punch in the gut to him that she would agree to marry someone new, after only dating them for a few weeks, and so soon after breaking up with him. Mac is crushed.”

[Related: Mac Miller drops three new records.]

Update: Mac's peeps have dismissed the Hollywood Life report as "100 percent false."