You absolutely have to cut off contact with the other. Often, the other thinks you can instantly switch to some kind of friend mode. Or, if they have never been in love, they have no idea of what is involved in falling out. If you have been diligent, you will have deleted all social media channels of contact. You must do this. You cannot hang onto these connections. They will slay your soul as the other displays indifference to your suffering and grief…