I can offer some general insights on the topic.
Whether or not your ex knows if you're moving on depends on the communication and interactions you've had since the breakup. If you have been in contact or have mutual friends, there might be signs that suggest you're not fully over the relationship. These signs could include talking about the past relationship frequently, expressing strong emotions or sadness when the topic comes up, or avoiding new romantic relationships.
On the other hand, if you've been maintaining distance and not engaging in behaviors that reveal your emotions, your ex may not be aware of your current emotional state. People can cope with breakups in different ways, and sometimes it's better to take time for self-reflection and healing before getting involved in new relationships.
If you are finding it challenging to move on, consider seeking support from friends, family, or a therapist to help you process your emotions and move forward in a healthy way. Remember that healing takes time, and it's okay to take all the time you need to mend your heart.