@Willowtree of course it's good to see how our insecurities can get the best of us and we don't feel good about it, but don't beat yourself up about it. You are human and it's natural to feel insecure here and there, and especially in these types of situations. Even when you're aware of things, you may still go through these moments and slip once in a while.
If he can't handle that, then he is not ready or able at this time to deal with a relationship. It's not your fault.
If he can't handle that, then he is not ready or able at this time to deal with a relationship. It's not your fault.