If they are ignoring you, they likely do not want to communicate. [substeps] Consider asking questions to find out what the boundaries are.
[header] How to avoid becoming a " psycho ex " [title] Establish boundaries of communication. [step] Depending on the nature of the break-up, you and your ex need to establish some ground rules about communication going forward. While you may want to talk or contact them still, listen to what your ex says.