Key Seeker, been there and done that in 2 countries. You can analyse it until the cows come home but it won't change the outcome. However, you can spend the rest of your life looking backwards and never see the opportunities ahead.
So. Regroup and rethink. Be as objective as possible as to where you fell down. Blaming the company is counter productive and won't help.
See if there's any where possible to sort out the issue. Flying a piston with an instructor to regain some confidence. Only you know what you need.
Yes be honest. It's a small world and liars are eventually found out. Look for a job that isn't quite as demanding. (Not knowing what type you were on I can't say exactly what to look for). Don't be in a rush to "get back at your old company". Move on.
It worked for me. (jet captain)