Is there ALWAYS OW/OM when they drop the bomb?

As most of you know, mine did in Dec and is filing D now
but has always denied OW. He said I needed there to be something to blame his decision on. That it wasn't OW. It's me. It's him not being happy anymore, feeling like he was losing himself and didn't want to fake it loving me anymore.

Guess I am just wondering if there has ever been a time where this has happened in MLC/WAS where there wasn't OW/OM?

Thanks!