A Hello there. Thank you for reaching out. I'm sorry you're having to go through this.
It is difficult to tell without seeing your preoperative photos, But the pictures you sent definitely imply that Your repair Might have "failed". In other words, yes, stitches can break, They can tear through the abdominal fascia/muscles, and the diastasis can "come back". Unfortunately, the only real solution to that is to Repeat the surgery. Depending on what the surgeon finds at the reoperation, Occasionally we need to Perform a more aggressive abdominal wall repair. As long as there is no hernia, you are "Safe", But from a cosmetic perspective you may want to Investigate your options. I would recommend going back to your surgeon and by comparing Photos, and a physical exam, they should be able to present your options. Good luck, and I hope this helps.