I can't be sure without a link to your deleted question but yes, closed questions are deleted by the system after a while. You can see the details [here](http://meta.stackexchange.com/a/92006/203101), but it short:

> **If the question was closed more than `9` days ago, and ...**
> 
> - not closed as a duplicate
> - has a score of 0 or less
> - is not locked
> - has no answers with a score > 0
> - has no accepted answer
> - has no pending reopen votes
> - has not been edited in the past `9` days
> 
> ... it will be automatically deleted

This is not a judgement on you, no humans were involved in this deletion. It is simply part of the automatic cleanup that is part of the Stack Exchange system.