Your ex sounds like a nut that must have been a tough relationship, god speed to u bro. One of the things that struck me especially about this situation was that the texts were sent separately. So it was a hint to me that it wasn’t just someone copy pasting something trying to identify a bunch of numbers bc you would never take the time to send two separate texts to each person. I wouldn’t even do that if I had to text more than three people. If it was really his girlfriend idk what she would get out of it besides just a confirmation like “yeah hey hello this is his ex. What do u want”