A: Thank you I expect more about the missing info & detailed explanation from you. Please Don't leave. Thank you again

B: I've been waiting for the anime adaptation since years so I'll stay be sure of that XD!

Could I say the structure is: I will stay (and will) be sure of that?


It is poorly punctuated and hence hard to read. Apparently it means "I'll stay, you can be sure of that!", i.e. you can be sure that I will stay. Some kind of punctuation is needed between "stay" and "be".

"since years" is wrong (should be "for years").