The 49-year-old actor crossed over to the sport in 2000 and was crowned WCW's heavyweight champion of the world, and his then-wife admitted she was baffled by the sudden career change.
She said: ''I was on 'Friends', everything looked pretty good with our careers, then all of a sudden he wants to start wrestling, and I remember feeling embarrassed because there was nothing small about the way he embraced wrestling.''
David - who also has 16-year-old Coco with Courteney - admitted he's done some things that have ''embarrassed'' himself so he's pushed himself even further.
He told The Guardian newspaper: ''At a certain point I realised I would put myself in positions to embarrass myself, so I would then beat myself up more. It's like putting yourself in a deathmatch - why? It's numbing yourself with pain.
''But I don't want to keep making the same mistakes again.''
The 'Spree' star's wife, Christina McLarty Arquette - with whom he has six-year-old Charlie and three-year-old Gus - admitted David's love of wrestling damaged his career.
She said: ''His involvement in wrestling really hurt his career.''
Courteney and David - who split in 2010 - are set to reunite on screen in the upcoming 'Scream 5' but the actor insisted it won't be a problem.
He said: ''No, it's been 10 years now, so there's been a lot of healing.''
At the heart of the actor's love of wrestling is the fact it reminds him of his late father Lewis and it's a way to retain their connection.
He explained: ''My dad used to take me to matches, and he was the voice of Superfly Jimmy Snuka [on Hulk Hogan's cartoon, 'Rock'n'Wrestling']. He died when I was 29 and I really miss him.''
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