I need advice and opinions!

Sera
I've been dating my boyfriend for almost three months, we were friends with benefits for about five months before that, and we've known each other for a year. It's the most positive, rewarding, and supportive relationship I've ever had, and he feels the same.
My question is: how do we know if we're moving "too fast"? And what are the cons of moving too fast? 
Kind of related: we want to move in together in two months time or so. 
What do you guys think??