You've lost none of your wisdom, honey, and you've been presented with an opportunity to gain more.
Of course you 'love' him but is he worthy of your love? Once we've persuaded ourselves that we've found our ideal partner and that we are in love with them, it can be remarkably easy to fool condition ourselves into believing that they're the one and only and, as such, are essential to our happiness.
Draw up a list of what you love about him - and what you don't love. You may be suprised to discover that there's not really a lot to love about a coward man who chose to make such an announcement a) without prior warning and b) at a counselling session when you were, presumably, under the impression that you would be exploring ways to make your marriage work rather than dissolving it. Has he always been such a devious and controlling worm?
The fact that he revealed his obviously long considered list of 'arrangements' in front of another person (albeit a counsellor) may have destroyed a fair amount of love and respect you have for him - it certainly would have done it for me. What a deceitful way to treat a spouse!
You may feel in bits but put your brave face on and let him go. And then hotfoot it to a solicitor who specialises in divorce and family law to define and refine those 'arrangements'. Or post on the Legal board where you'll find some excellent lawyers and these days there's no need to spend hours in face to face consultations - don'cha just love modern day technology? 
You've got your own remarkable well of sage knowledge to dip into and you know that the wisdom and support of this board has sustained many through trials by ordeal such as the one you are going through - with a few laughs to relieve the tedium of tears.
Once you've got through this you''ll be invincible. It's not what you hoped for, it's not how you planned your life, but gaining that particular nirvana is worth the pain.
(((hugs)) and 
are the order of the day/evening - go easy on yourself while you process the shockwaves of changed circumstances.
One fine day he'll realise what a immense error he's made, but when he does the chances are you will be so over him that the love you once felt for him will be a dim and distant memory.