But this time he has just about finished me off.
Oh no, he hasn't! Don't believe that for a second.
58? Pah, that's no age at all!
I took early retirement at 55, trained as a teacher of adults (so I could teach bread making), did a Cert Ed - and then wound up with a degree at the age of 60.
Been teaching now for 23 years - never been happier (in that I found out I should have been a teacher all along!)
About your ex:
I've often wondered about this sort of inadequate. My feeling is that they've always been aware of their inability to function as a normal, caring human being. And at some stage they'll be found out, no matter how they try to hide it. So they take their frustration out on those nearest to them - if they can have some sort of control over their partner, this makes up in part for their lack of common humanity and feeling!
Your ex has lost his marriage - which he never really cared for, since he only cares for himself; and he's lost his sons - he'll never regain their respect.
No matter what he thinks he has gained ATM, he's still the tosser he was with you. He hasn't changed - how long before his new arrangement goes tits up? He'll die alone and friendless is my forecast.
There will come a time when you'll feel nothing but pity for your ex. Not yet - it's too soon. But it will happen, I'm sure.
In the meantime, you will grow as a human being - away from his stultifying presence, you'll flourish! 