Fiancè's ex reached out to him

I noticed the messages on his phone and went through them. She had reached out to him. This ex was super skinny and gorgeous and everything he could want and I he ONLY reason they broke up is because he had a lot of issues dealing with childhood trauma and she became more his mom/therapist than his girlfriend. She reached out to Congratulate him on getting engaged. He thanked her and she sent this super long message about how she does still worry about him and that she's so happy that he he's doing better and like she said if anyone deserves happiness it's him. He sent her a message apologizing for being so high maintenance and that he shouldn't have put so much of his baggage on her and thanked her for being there and he's happy for her too. She apparently just had her second kid. After that they wished each other well. I don't think he needed to respond at all to her. That haven't been together in a long time.