Is there any difference between "ever since" and "since then" at the end of a sentence?
Is there any difference between "ever since" and "since then" at the end of a sentence? Are they interchangeable? Are there some cases when one is preferable to the other?

Thank you very much! :)

Question

Is there any difference between "ever since" and "since then" at the end of a sentence?
Is there any difference between "ever since" and "since then" at the end of a sentence? Are they interchangeable? Are there some cases when one is preferable to the other?

Thank you very much! :)

Answer

They are the same. 
I think you can use them interchangeably. 
Also, you can put "Since then" at the beginning of a sentence also.
For example:
"Since then, I have been working at the airport."
or 
"Since then, I have not seen him again."

If you use "ever since" at the beginning, you need to add more information.
For example:
"Ever since I went to Italy, I am addicted to pasta."
or
"Ever since my wife left me, I have had to cook for myself."

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