Is Mountain Dew destroying my relationship..?

Hey guys :) ok so, I had my first bottle of mountain dew about 5 days ago... Since then, I've been having like 1-2 500ml bottles a day. Just today, my girlfriend said I've been acting weird/ different..? I'm only 16, but apparently my sex drive has increased, and I've become "cocky". Cocky means cheeky, saying things that are risky that I usually wouldn't say. I think that's what it means anyway. So do you guys think it's to do with the Dew..? I'm English btw, so the Dew only just recently arrived. Man I love the stuff; but depending on what you guys think, I reckon I'll quit dooing the Dew. What do you think..? Thanks :)