Anxiety and Relationships

So my SO and I both have anxiety. It’s great sometimes because we understand each other’s struggles, but it can be frustrating at times. I’m currently struggling with the anxiety that he’ll leave me if I do anything wrong. I know that this isn’t true and he’s a super loving and supportive partner, but I still worry. Sometimes it keeps me from expressing my feelings because I’m afraid that something I do will be the final straw. It’s exhausting to be this worried all the time. Has anyone else struggled with this?