I am one of the most sensitive people on the planet, so I truly understood that you felt hurt and ignored, and that it seemed no one cared. I felt really bad about that because I have felt that way before myself (not here in particular). I just think you have reacted to that in a rather angry way that makes people defensive, and you SEEMED to come across as blaming your fish's death on your lack of response. There's no fault involved in all of this. I think it's more a matter of hurt feelings than anything. If you had posted a thread that simply stated your fish had died, I bet you'd have gotten lots of sympathy and understanding, but your post comes across as blaming the people on this forum about it.
Anyway, I am sorry you felt ignored, but I am sure no one intentionally looked at your thread and thought "I can help that person but I just don't care." I am pretty sure not one single person had that thought. I hope you do decide to get another betta and that you'll find this place as helpful and informative as I have in my short time here.