The concept of normalcy is a relative phenomenon, based on a specific context, your values, perceptions, and experiences. What is considered normal is everything you personally go through. For example, is it normal to experience betrayal in a relationship and still desire to maintain a connection with an ex-partner? It can be considered normal because if you delve deeper into this topic, you will find reasons that drive this desire, and those reasons become the identifiers of what is considered normal. However, this pertains to normalcy in a broader sense.

Communication with ex-partners can be considered normal interaction if it doesn't hinder your psychological well-being or impede the development of new relationships. If it emotionally destabilizes you or hinders your progress in creating new, strong, and happy relationships, then it is not normal, and you should definitely reconsider your decision to maintain that connection.

I believe it is important to respect yourself and your needs, and if maintaining that connection brings you benefit, it should be done consciously and constructively.