HI,
I know you did not do anything to put your rooster in danger..........as implied by some other posters.
I agree, he may have been taken by a preditor.............He may also return on his own when he feels like it.or could be confused about getting back to the coop.
This is really hard enough when we lose a chicken without having guilt pilled on.
I purchased 4 three month old sliver laced wyn's recently.They were so cute and just hung around with each other. I paid a lot for them.I had them out with my others,24,just a few weeks younger. When I went to check on them..two of the new ones were missing. I believed they were safe.or I wouldn't have had them out......the two of them disappeared,not a sound, not a feather.....we looked and looked.and waited and waited hoping for their return......Anyway, I do not know what happened to them.am thinking hawks now.
Don't be hard on yourself. These learning curves are difficult and sometimes even our best efforts fail.