It must have been hard, but it was the right thing to do. I assume this was an escalation over his previous behaviour. You've drawn a line - don't back down. Don't let it get any worse.
I don't really want to make recommendations because I don't know the whole context, but if it were me, I would have the three of you sit down, and discuss a plan that ends with him leaving the house and getting a place of his own. If he needs help getting a job to be autonomous, there are probably resources in your country that provide that. There's no shame in going through these, I went through such a government-provided service myself 25+ years ago as I was having trouble finding a job largely due to faults of my own. They helped be find a job that I never left - in fact I took over the business when the owner retired 7 years ago.
It took my father to convince me at the time to go through these resources that ultimately helped me land a job and actually start standing on my own two feet.
