Anxiety in new relationship

Have you ever finally found something that you’ve just been waiting and searching for and when you finally have it you are just so terrified of losing it? I recently got into a new relationship, saw each other for 2 months and have been official for 1 month, and i feel like this. He’s just everything I’ve hoped and prayed for after being treated so poorly in the past and I’m giving myself anxiety and working myself up over the thought of him leaving or changing his mind. I know this is a me problem and not a him problem because he’s given me no reason to not trust him but i can’t help it. Does anyone have any advice? :/