OP, I know this is really hard, but you need to dig deep and change track. I have been with my DH 30 years and he has done this twice. What he is doing is script. He is not unique in his actions and so the textbook response is the best way to go.
DO NOT cry, be sad, beg, plead with him. As you can see, it doesn't work and it makes him swing even more into the leave camp. This WILL not get him back.
Do this:
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Do not spend anymore time waiting around for him. Make an action plan. Send the next 3 months working on YOU. Get fit, get healthy, get your hair done (or lockdown self treatments etc.), look after your skin, sort out your wardrobe. Do whatever you need to do to look your best. This has NOTHING to do with him, but all about your self esteem.
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Don't call, text, email him. Let him contact you. You are too busy with your own stuff. He is the one who wanted time alone, so crack on.
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Book stuff to do WITHOUT him. Do it for you and the DC, you and friends and you and your family. Arrange for after lockdown of course.
Show him that when he is not there, you are better off. You look better, you are fitter, you go out more and you do more. When he is not there, life still goes on.
Do this and at some point you may wake up and think, actually I prefer it when he is not here and/ or he will crap himself that you are flourishing without him.
My DH has done this twice. At first I reacted like you, but then did the 3 things above and he came crawling back. Part of the reason why I took him back was that I realised he didn't hold all the cards and if he goes I will be OK. I'm happy for him to stay, for now whilst he pays for everything for my DC
Listen to the song and read the lyrics of I had a Little Time by the Beautiful South.