Sounds like the bearing is toast...
When I suspect a front bearing is going south and the engine is still together. Get your electrical motor spray out,contact cleaner or whatever you have, put the straw on it and while it is warmed up and idling try to spray behind the flywheel.Not a long blast, just a short little blip of spray, if it kills the engine instantly then your front bearing is letting junk in and needs to be replaced.
Hope this helps in the future