There's no excuse for him to do absolutely nothing to acknowledge you on Mother's Day. Your kids are young adults, not toddlers, and even if this week was really busy, he had the the weeks and months leading up to Mother's Day to at least get you a card. Also, it sounds like you were the one running around and doing all the hard labor for your daughter's graduation.
And to top it all off, he acted like a miserable sad sack the whole day. If his back was hurting him that badly, he should've stayed home. Instead, he made a day that was supposed to be about celebrating you all about him and how unhappy he is.
I know you don't want to hear this, SatyaMom, but this is not the behavior of a man who "wants nothing more than reconciliation." If that were the case, he would've pulled out all the stops to make Mother's Day special for you: card, flowers, gift, special meal, etc.
This would've been so easy to do... and you're so eager to make this marriage work and see the best in him despite everything he's done that I'm 100% certain that you would've clung to even the smallest gesture of affection as a sign of "progress."
So the question is this: why did he blow this opportunity so badly? I think the reasons are pretty clear:
-He resents you for setting boundaries with him and not tolerating his cheating. He might not have been conscious of it, but he was acting out against you on Mother's Day.
-He thinks he can guilt you into taking him back (because he knows you feel responsible for "keeping the family together")
-He feels entitled to have everything back to the way it was before.
-And worst of all... he's so emotionally immature and solipsistic that he can't get his head out from his own ass for long enough to recognize how is own selfish and petulant behavior is impeding his goal of getting you back.
As you reflect on this past weekend and what you need to do going forward, I think you should remember that the point of this separation was not so you could have more time to yourself, do things that you enjoy, and work on your own self-improvement (although those are important things to do during the separation).
The purpose of the separation was for your husband to work on himself and show you--through consistent action over an extended period of time-- that he's committed to long-term change and can be the safe, reliable, and loving partner that you deserve.
From where I'm sitting, his actions since your separation have demonstrated the opposite.
edit;add:
Pretend, for a moment, that you and your husband just started dating and didn't have kids or a long history together. How would you have felt if he did nothing to acknowledge you on an important holiday? How would you feel if he acted like a stick in the mud during a celebratory event? How would you feel if he did nothing but complain about how much he hates his apartment and why can't he move in with you? Would you want to be in serious relationship with someone like that?
If your husband had any sense whatsoever, he would be in full-blown courtship mode right now. He would be acting like he just met you and is trying to win your heart because he should be a different person that you would need to get to know, trust, and fall in love with. Even if he doesn't feel like the best version of himself at the moment, that's who he should present to you, especially during special moments like this past weekend when it really counts.
[This message edited by BluerThanBlue at 3:19 PM, Monday, May 12th]