I feel like I've failed him once again...

Asshole wrote an email just before the kiddo's birthday asking if he could see him. Once again we gave in and made arrangements to meet at the bowling alley on a Saturday morning so that they could spend a couple of hours together. We met, they bowled, he even congratulated me on my wedding and things overall went better than I had anticipated. This was almost a month ago. We've not heard anything from him since. My biggest fear in even letting this happen was that he would disappear again and it's exactly what happened. I did it for the kiddo and in the end I just set him up for disappointment once again. This makes me want to cut him out all together, to not acknowledge his calls or emails when they come again in who-knows how many months from now.