(A), (B) 始末だ is an expression that is used to show that the unfavorable (B) is the end result of the event or series of events caused by (A). It can be used to express a speaker's disappointment or irritation. It is often used with expressions like あげく、結局、とうとう and so on for emphasis.

この始末だ is a set phrase indicating exasperation at the current state of affairs.