You don't sound very sorry, and have provided no reason for us to think you won't come back and grief for a third time.
You just seem to think that you've been banned for a long time, and your grief wasn't a big deal, so "plz can unban ... so thanks".
I don't know how old you are, but at some point you're going to have to learn about how harming others is bad. If you harm someone, you need to be able to apologize and show us you won't do it again. Until then, no we won't unban you.