It can sometimes be difficult to tell what things do and don't warrant a trigger warning, so please don't feel bad about not having one to start. I appreciate that you added one now.
Also, please don't feel bad that it invoked such an emotional response for me. Good story telling often leaves an emotional impact, which is exactly how I felt while I was playing. I wasn't expecting it, which a warning beforehand would have helped with, but I'm glad I played, and I'm glad you did such a good job telling the story you you did.