"我大老板发现我不领导该项目了,问我原因.我如实说了"
You should say "my boss wants to lead it by himself and I think he will do a wonderful job". you should not be unhappy at all.
"1年后,因项目不能完成"
did you support your boss 100% for the project???? If you can finish it on time, you should support ur boss to finish it.
"我老板同我谈希望我能给他做.我不同意也不能理解他"
why not? how can you not understand? it's his destiny to finish this project, and you should let him lead and support him 110%.
"而是给他. 我很生气,将这事发给大老板"
wow, how can you do such a thing!!!
"我不想伤害我的老板,没想到事情会到HR"
You are hurting your boss deeply, most importantly, in front of his boss. HR is no issue.
I don't know what to say. You should really have a nice chat with your boss and show him that you will support him 120% to finish the project.