How do I stop talking to him without being rude

So my ex decided to hit me up after a year with that “how have you been?” Text. I shouldn’t have answers but sadly I still have love for the guy. Long story short we have been texting everyday for almost two months. The conversation isn’t really going anywhere substantial, we have talked about life and tv shows and work and school but really nothing else. I’m pretty sure I’m just a placeholder or he’s just lonely since he had t said anything like “I’ve made a big mistake leaving you”😂

I feel used and stupid, but I’m ready to cut it off. How do I do it? He’s not a bad guy so I don’t just want to be super rude and ghost him, do I just let the convo fade out and make my replies longer or something?