Can someone give me an ideas on what to say to break up with a casual Situationship?

Long story short we’ve been basically friends with benefits for five years. I text him last week and asked does he have a girlfriend he text back “nope” I replied OK because if you do, I’m not gonna be coming to see you anymore and he texted back “I know you wanna be my wife lol”. I jokingly said back to him yeah for the low price of 30 bucks and some change I could be yours forever at the county clerk office. That was the end of the conversation. but it’s the fact that five years is too long for me. I’ve tried to break it off with him several times before and he’ll just blow my phone up begging me. I told him the whole bill of how I want more. I deserve more than just a casual fling and he still just does not try to do anything serious. I’m a loyal person. I can only mess with one person at a time and I want to move on with someone who wants to be more serious. I’m heartbroken because I do love and care about him and we’ve told each other we love each other, but he’s not trying to make any moves on be more serious, other than having me spend the night with him on weekends. That’s not enough for me, I want more. I hate to be a horrible person and block him but it’s the only way I can keep from falling back into his trap. He’s even showed up to my job before a few years ago when I wasn’t responding to him. I guess I’m just venting right now because the thought of not seeing him anymore makes me sad but at the same time I want more than obviously what he’s willing to offer. The most romantic thing we do is he’ll order us dinner and we’ll spend the night at his house, talking and having sex. I’m too old for that BS at this point.

Can someone give me an ideas on what to say to break up with a casual Situationship?
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