unfortunately not everyone feels that same about pets as we do, she probably doesn't realise how upsetting you would find this sort of talk
there is no reason you shouldn't get him back, people do all the time and under the strangest circumstances I can think of a few notable ones we've had other the years, one who was living a few feet from home in a hedge but just didn't realise, one who escaped at a motorway service station and was trapped a few months later. keep your chin up, I'm sure you will find him you are determined enough