how did you cross from dating to official couple ?

I really like the boy im currently sleeping with and seeing and I'm pretty sure he likes me too but I'm starting to get impatient at how slow it's moving 
2 months dating and still not official
We met on New Year's <a href="">Eve</a> 
Some stories would be good about how to went from dating to actually offical couple did you have a discussion about it or did he actually say 'do you wanna be my girlfriend'