I edited two posts so far. And I never saw my changes were accepted nor rejected. In the edit history they do not show up.
You can see all edit suggestions you've made in your own account, on the "activity" tab, with the "suggestions" filter:
It looks like you've made four suggestions. The last two have been rejected, but the first two were approved. Each link in that list goes to a page for the suggestion, which will show you the rejection reasons. Rejected suggestions don't appear in the post's revisions list because, well, they didn't make a revision and aren't part of the history.