I'm deteriorating from within.

I'm not sure if this is better suited for a mental health discussion, but I'm genuinely at a loss for where to turn. I recently started my first relationship over five years after divorcing my mentally abusive ex-wife, and I’m realizing just how much damage that experience has caused, often in ways I didn't even notice before. When I was single, I wasn't aware of these issues, but now it feels like I'm on a self-destructive path, and it's honestly terrifying. This is the happiest I have ever felt, yet I'm constantly worried that I'll say or do something to ruin it. Here are some of the thoughts that keep racing through my mind: 1. Why would she want to be with me? She could definitely find someone better. 2. What if she meets someone else and decides to cheat on me? 3. I'm so annoying; I'm going to push her away. 4. Why would anyone love me? I feel worthless. 5. Deep down, I know I'm just setting myself up for heartache—why prolong the inevitable? There are countless other negative thoughts that swirl around, but these are the main ones. My partner is incredibly sweet and caring. Sure, I annoy her sometimes, but I feel like I annoy everyone. She hasn’t given me any reason to doubt her loyalty, and I trust her completely. We share everything, including our unusual interests (which I know I need to ease up on), and we've established a foundation of total openness and honesty. Still, my anxious mind keeps telling me I'm not good enough. What can I do to address these feelings?