So, long story short, I love my best friend. Today we were texting about a college subject and out of nowhere she said basically "I REALLY need a boyfriend", so I froze and answered with some jokes about Canada(she said once she wanted a Canadian boyfriend, we're Brazilian), like "You really want to delve in the Canadian winter? Their money will break", and shortly after she changed the subject, we've talking regularly ever since(this was a few hours ago). Did I screw something up here? What should I do? What could I have answered?
Note that I absolutely adore our friendship and seriously couldn't stand messing this up.

Tell her how you feel about her, or you might end up in some unrequited friendship/relationship 10 years down the road.

Hey, only just came across your thread and new to this forum so not sure if you have replied with you outcome but my advice is go for it.

I was in the same boat pretty much.  I was best friends with a girl and really facied her sister, me and her sister got close and became best friends and I was certain she was straight but I told her how I felt anyway and that I didn’t want too loose out friendship over it but I had to tel her my feelings, she was fine with it at first but we was just friends and over time it got stranger and one day she kissed me, fast forward 7 years later and we’ve never looked back and with being friends first the relationship has been that much stronger although iv joined this site with a problem I 1000% think you should tell her how you feel x