1. Curiosity mentality: may be curious about the current person and want to know about their personality, lifestyle, etc.
2. Comparative mindset: Attempting to compare the differences between the current and former through chatting, seeking affirmation of self-worth or reflecting on past relationships.
3. Compound attempt: There may be an intention to compound, by chatting to test the current's attitude towards the ex and see if there is a chance to rebuild the relationship.