Anxiety over missed calls

Hi girls I need some help please. When I was in my last relationship, my ex boyfriend would ignore my calls or not call me back whenever he missed the call. Whenever I asked him about it I got cursed or an excuse as to why he didn't call me back. I'm now talking to someone new and whenever they miss my call, I start to get anxious and overthink because I'm now wondering if they are doing the same thing as my ex. I know everyone isn't the same but sometimes my anxiety acts up and I get worried and start to think that maybe my new guy doesn't want to talk to me. How do I get over this?? It's driving me crazy.