Stop remove to SitePages from site on feature deactivation

Hi,

I have create on module which is add in SitePages and add the webpart page and set that page as a home page of site on feature activation. and on feature deactivation I have wrote a code which will set the default.aspx as a home page of site. I have not wrote any code to remove my custom module then also it will remove custom module on feature deactivation the problem is that it will also remove the SitePages on feature deactivation.

Code of Elements.xml of CustomPages module

<Module Name="CustomPages" Url="SitePages"><File Path="CustomPages\Sample.aspx" Url="CustomPages/Sample.aspx" Type="GhostableInLibrary" /></Module>