Help! Am I being insecure?

I've been in a serious LDR for 5 months (900 miles apart). He's awesome. He's paid for the 3 trips he's come to see me and the 2 trips I've gone to see him. I've met some of his family and he's met mine. He's made it clear, were in a monogamous relationship with marriage as the end goal, and all of our convos have been purposeful, like asking deep questions about each other. All good right? So why do I feel so damn insecure?

If he doesn't text me for hours, I'm worried. If he's quiet for a minute, I assume he's angry. Even when we spend time together, I'm convinced he secretly can't wait to get away. All of these things actually happened in my last relationship (And worse) so I'm terrified of being hurt again. How do I get over it?