From the perspective of the freaked out primary, I can tell you that sometimes I communicate things like this to Easy, and it's just that, communication. I'm letting him know how I feel and that I might need his help to work through it. Since she said that it wasn't anything either of you did, it sounds like she wasn't so much upset as nervous. I second the idea that she's got some stuff to work out, but it doesn't sound like anything you need to worry about, and certainly not feel guilty!
Also, if there are problems that you're not causing intentionally, if you're behaving normally and in a mature, adult fashion, then you're not actually "causing" them, do you know what I mean?