How to Cut Off a Man Who’s Deep in His Fantasies

I’m a woman in my mid-20s, a Type C, and the man I’m seeing is in his late 50s and divorced. Apparently he really likes me and seems to be fantasizing about marrying me. We didn’t meet through this club, but it’s a similar kind of place, so I’d like to ask for advice. Lately, he’s been constantly telling me things like, “I like you,” “I’m even thinking about becoming husband and wife,” and, in response to me saying he needs to use a condom, “If you get pregnant, we can just get married.” He keeps bringing it up over and over and sending me messages about it too. Every time, I reject him pretty firmly, and I’ve clearly told him, “I don’t see you as a romantic partner. I’m seeing you because money is involved,” but it seems like he isn’t hearing me at all. He’s getting seriously annoying, and I don’t want to see him anymore. Are people like this the type to become a hassle if you suddenly cut them off completely? Should I gradually fade out by saying I’m busy with work or something? This is my first time dealing with someone so clingy—someone who’s running wild based solely on his own feelings—and honestly, it scares me a little.