Friend with benefits...ready for more?

I started hanging out with this guy about a year and a half ago, and we went out, he would buy me drinks, dinner, etc... I told him that I wasn't ready for anything like that. Then about a month after "hanging out" I suggested FWB relationship. That has been going nicely for a year and a half! :) So, now the more I get to know him, the more crazy I am about him and I'm ready for the next level. But I'm not sure if he's interested. What's a girl to do?