Right, so now that you've told him (through his sister) how he needs to act, he's playing the part.
It's kind of meaningless now that he's been told what to do.
He also is still lying to you and plans more affairs.
That's what's on offer - a relationship with a philanderer who chose you to be his stay at home wifey who expects you to wash his clothes even when they're dirty from his latest assignation with his mistress.
He doesn't respect you.
He hasn't shown any respect for you at all in (ever?) months.
Not showing you his phone last week said it all.
And as for giving him space to "grieve" the *very real" feelings he had for some woman he barely knew. Give me fucking strength.
You are not his first choice. He has already told you that you are his compromise choice. For his own reasons he wants to stick with that choice, but there is no reason to believe it is out of love for you.
His number is, and always has been, himself.
He puts himself above his own daughter in the importance stakes.
But then she is female...