Fwb advice….

Been friends with a guy for 16 years and out of those 16 years we have been for 13 years. I love him and he loves me. We do not have other sex partners or see other people. Sometimes I hint about a relationship. He would say something like we should be around each other for like a week straight or something . Like he’s trying to figure out how I am?! But he’s known me 16 years and can’t see how I am?!! I told him over and over I don’t change how I act, or who I am. Well lately this has been bothering me. I just feel like I can’t do this anymore. The fwb thing Just feels like I’m wasting my time and this isn’t going to get anywhere. I can’t be someone’s fwb forever. I’m 38 I want to settle down. What would you do? How do I tell him? Or just cut off completely?