Fwb advice

A few months ago i started talking to this guy and he said he wanted to be friends with benefits and i wanted to try it too so i said yes. We’ve been seeing each other pretty regularly and it was usually like just about sex and he is very fun to be around. The past 2-3 weeks have been different though, we started seeing each other more and talking every day. He spent the night at my house every night this last week and we don’t hang out only to have sex. We’ve been going on walks and eating together and talking about things. Im starting to have feelings for him and i want to tell him that i want something more than fwb. How do i do that? And if he doesn’t feel the same way i don’t want to lose him completely. Any advice?