Questions: Guy's Behavior

I went to a social gathering to network with other folks who travel solo or in group, basically to learn from each others experiences. This guy came up to me and started talking. Over the next 30 mins, he just went on and on about his job, his apartment that he owns and the three side businesses he runs. He also tried inquiring if I was interested in having kids later in my life. Basically, he was selling himself and trying to gauge if I fit in his "requirements". He happened to ask for my phone number and I gave it. I know that I have to learn to say no and I have decided what to do next time some guy asks and I'm not willing to give. Out of being polite, I just continued the conversation and at one point, I moved into a group of guys and girls to avoid talking to him one-on-one. I did notice that he was also exchanging numbers with another girl in the group. Seems like a player.

Anyways, so he texted me the time I shared my number and I didn't read those messages indicating to him that I'm not interested. He texted me again a few hours ago asking how my week is going and if I'm free for coffee on Sunday morning. I haven't opened the message to read it as it flashed on my phone screen and I was able to read it there. So, now he thinks that I haven't read his message.

I do not want to talk or meet him. Should I just ghost him? I know its not mature thing to do but I'm done being nice already.