Como dizer "acabar com a vida" em inglês

In a less dramatic tone:
My last boss gave me a hard time.


But then, it suggests that you are talking about him at a given time, that is, that time is past and it may or (may not) left permanent side-effects.

In My last boss ruined my life.
it slightly hints that the side-effects are still in place, however it may or may not left them, it will depend on context.

Dear all,
deep thanks for the answers! They all apply to what I needed.
It was very nice of you!

Hi! Here's how I'd say it:

My last boss ruined my life.
My last boss made my life hell. (I'm not sure if this sentence is correct.)

[]'s

Olá Pessoal,

Mais uma:

My previous employer messed up my life.


Boa sorte!

Hello people!

My last boss finished off my life.

See you.

Hi people!! My suggestion:

My last boss destroyed my life.

Take care.

Hi, Daniel! Thank you! That makes so much sense!
Have a good night

How're doing Anita?

My last boss ruined my life

Take care

Daniel