I agree with Derby. Plus, I would let go of this need you have to give the kid the stuff you bought. I don't see your ex's reactions to that as dastardly as you do. She probably feels betrayed in some way, that you were there for her and then rescinded, so now she wants nothing from you. The kid will be fine, leave it alone.
The world opens up... when you do.
"Oh, oh, can't you see? Love is the drug for me." ~Bryan Ferry
"Love and the self are one . . ." ~Leo Buscaglia "