I failed to get a job, and I failed at marriage.

[keannu]

Which is better?

1, I failed to get a job, and I failed at marriage.
2. I failed to get a job, and failed at marriage., too
3, I failed both in getting a job and marriage..

 

[emsr2d2]

Here's a list of the errors:

After the number 1, you should have a full stop, not a comma.
After the number 3, you should have a full stop, not a comma.
In sentence 1, you don't need a comma after "job".
In sentence 2, you don't need a comma after "job" or a full stop after "marriage". The closing full stop is missing.
In sentence 3, you should have just one full stop at the end.

On that basis, they're all wrong so none of them is "better".

 

[Tarheel]

I failed to get a job, and I failed at marriage.

That's the only one that's grammatical/correct.

The question should be, "Which one is best?"

(My opinion.)