@Diabetes123,
Your DH is probably talking to somebody who is giving him advice too, and judging by what's been happening with me, things change so many times! He asks to give you space, three days later he gets back in touch because he misses you, then he withdraws to protect himself from pain again and so on and so forth. Don't take each daily change as some kind of earthquake, it's all very fluid and everyone's feelings will change lots of times, you need to keep it in mind and not take every new development to heart.
Maybe only your younger teenager will stay in this black and white mode for a while because that's what teenagers do. I was 16, on the cusp of 17 when my Dad left, it was different because he had an affair etc, and even though he was a great DF and raised us more than DM, or was way closer to us in our childhood, for me in my teenage mind he was written off because of his behaviour and affairs etc.
Of course years later I realised affairs were just a symptom of an unhappy and unfulfilled life (he left the OW very quickly) which he was trying to run away from in any way he could/knew how.
Maybe talk to your councillor about how you could best approach your DD2, maybe write a letter, or maybe your DD1 can say a few words to her, to the effect that both parents are human and both trying to do the best they can with the resources they have, and DD2 doesn't need to take sides. Maybe you could even approach your DH to talk to DD2 about it?
But ultimately don't pressure her and don't feel offended. At this age you wouldn't be spending that much time with them anyway, and at 13 they start rapidly pulling away from parents, and in a family who all live together you'd only see them normally at dinner(if they are not out at activities)/family holidays and given the choice a regular 13 year old wouldn't suddenly choose to spend prolonged periods one on one with any parent, it would feel weird if there's no particular reason to do so!
What she'd have to do if she were to see you, it would be slightly artificial, so she might be resisting because of that really. Or be worried there might be heart-to-heart talking which she is not at all equipped or ready to do. By 19 as your DD1 they already begin the natural pull back to parents, so it's different for her, plus she's out of that super categorical teenage phase by now(hopefully).
And definitely definitely don't take it personally if your DD1 remembers she wants to have a day out with her mate, they can't replace your friendships, they are your kids! It's great that she is able to tell you that without any fear that you are going to collapse into a heap! They are not there to make you happy, you are there to make yourself happy and then share your happiness with them, to rely or use them as crutches while you are down would serve all of you badly.
Concentrate on sorting yourself out through counselling and anything else you can think of, new friendships, activities, exercise, new knowledge etc (I know easier said than done with the lockdown and your job and hurting back but all of it it's not forever)
Download Duolingo and start learning a new language or something :)
As for the children, see if you could organise with DH's help some kind of easy activity outside the house, where they both come and DD2 knows there would be no heavy talking/tears/drama, maybe when cafes are open meet at a cafe, go to the cinema, something like that, where she's not fearing you'd fling yourself all over her with tears etc...she needs to know you are measured and patient...
Try to develop the attitude of "I'd be damned if I'd be sitting here and feeling sorry for myself!". Identify what you want, what the obstacles are in the way of reaching it and get down to getting rid of the obstacles. Good luck!