It truly amazes me how Hitler threw away entire armies when he was advised by the finest military minds ever produced to withdraw them when their position became untenable. FM von Manstein pleaded with Hitler to withdraw the 6th Army from Stalingrad after it became encircled. Field Marshall Rommel pleaded with Hitler to withdraw the Afrika Corp from Tunisia when it was no longer possible to hold on. In both instances, Hitler adamantly refused and over 600,000 troops were lost as result. Did Hitler WANT to lose? One wonders.
IMHO Hitler knew they would lose the war. I think he was just prolonging it as long as possible in hopes he could get a truce with the Allies and keep his dictatorship and part of what he had captured.
It was all about him and his ideas. He cared nothing about anyone else.
Just make the war as long as possible, kill as many Allies as possible and hope the Allies would get tired of the war and be happy to stop before invading Germany.