If your ex contacts you during your no contact time, it shows they've noticed your absence. It's crucial to remember that each circumstance is unique. Sometimes an ex who has broken off communication with you may still want to be friends. Other times, they may not feel the same way and would rather we stay apart. The only person who can really answer this question is your ex. If they don't want to talk to you anymore, there's nothing more that can be said on the topic. All you can do is move on with your life.