Gilbert didn't trust his words at the moment, and this confused him, normally he would say something awesome but right now, but he was too embarrassed to say one damn word.
I also love Prussia/Canada (Gilbert/Matthew), its my OTP! And if anyone found it, it won't be an awesome secret anymore! "Matthew Williams, also known as Canada glared and said "How many times do I have to tell you, my name isn't Mattie, the name I was given is Matthew! I think its about time I told them…" Gilbert shook his head and said "No, the awesome me will not allow this." the blonde rolled their eyes and said "Gilbert I don't think you have the right to say no to this, its my secret and I can do what I want with it…"Gilbert shook his head again and almost yelled out "No, its also my awesome secret too! As a matter of fact we wouldn't even be discussing this! " that's when Gilbert said "I don't care how many times I've been told not to, if those of yours would had stopped and took at least a glance at you when you were growing up, they would had named you Mattie, or in Francis's case, Madeline!
When she told Gilbert this, she rolled her eyes a few times and muttered something men and their stupidity of not knowing what gender is what.