More then fwb ?

Hey girls so I put a post the other day about how when my fwb contacts me I get really bad anxiety and start to shake etc .. well I was with him yesterday and for the first time I was so calm and back to myself and I've noticed our friendship slowly changing we just used to have sex and leave but we've been speaking a lot more lately.. and yesterday we were together for so long we had lunch and we didn't stop speaking instead of just rushing to bed.. his also been hinting things saying you're going to be such a good wife your my main girl your mine I'm going to marry you and his never said anything like that to me before .. is there any ways this could proceed to something else or ways to help it ? I love him so much and have never felt like this about anyone else , thanks girls !