What should I say now ?

A guy had been watching me for about a week and he finally decided to come up to me and ask for my number. When talking he asked was I busy on Thursday? I replied I'll let you know later. We then texted later that day the texts were boring and when Thursday came nothing was said about going out. So then we continued to text and I noticed he replied hours a part and went ghost for two days. A week went by and he hasn't said anything about going out and he hasn't even tried to call me yet. I hinted on talking on the phone but he hasn't took the Initiative. I realize I messed up . What can I say to fix it ?