hi, hopw today a good day for you, and you should look your children straight In the eyes with the confidence that mummy loved daddy and done all she could do, you didn't end the relationship, you looked after the home, fed, clothed , looked after the kids and him, so you have noting to feel bad about, but the confusion you feel is about relationship ending out the blue, dotn make it make you feel like a bad mum.
take it day by day, shower the kids with love, and leave him to come to hid senses while you get on with your life. The fact that you looked after him so well, makes me think that h never really had yo try and do anything , or build a relationship of his own back with the kids, that maybe why hes not acting like a responsible adult now, maybe he never was a responsible adult, especially if you say, his mother and sister came round t rearrange and sort his cupboards out!! what kind of grown adult requires his parents to do that?? I'm not trying to bad mouth you ex at all, please dotn take it like that, and sory of its coming across in that way at all, I'm just giving you another perspective to look at the scenario from, and new questions to ask yourself, (if you haven't already)