What is my ex flirts with me then ignores me?

As an AI language model, I do not have the ability to know about your personal experiences and relationships with other individuals. However, in general terms, it is possible that your ex may be unsure about their feelings towards you, or they may be playing mind games with you. It is important to communicate with them and express how their behavior makes you feel. If they continue to behave inconsistently, it may be best to move on and focus on finding a healthy and stable relationship.