Cutting someone off

I need advice in a situation I’m in. I started talking to this guy a few months ago. We had previously dated when I was 18. It didn’t work out because I found out he was talking to multiple women. When that happened I left and blocked him out of my life. Fast forward to 2018 he wanted to pursue me but I wasn’t interested. He tried but I just wasn’t having it. This year we reconnected again and I finally gave into giving him a chance to start over and get to know each other with the possibility of maybe having something else. Mind you he was so very  persistent and  adamant on showing me that he’s changed and he’s not who he used to be. He would text, call, and FaceTime whenever he wasn’t working. Eventually that died out, he takes forever to text back but will be on Facebook, Snapchat and Instagram but hasn’t shown shit that’s different. Briefly we had stopped talking because I wasn’t feeling the situation. He reached out and I brought it

to his attention the lack of communication and that I felt he was wasting my time. He apologized and said things would be different. He was good for 2 days and then went back to the same shit. Last night he said he was watching tv and talking to me but didn’t say shit or make conversation but of course he was on all social media platforms. He texts me this morning saying I’m sorry I fell asleep good morning. With saying all of this I’ve come to the conclusion I need to walk away and let this go. My problem is how to respond to the message and the correct way to cut things off. Any advice or ideas would be great!!!