There is a guy at a shop I frequent when I'm out and about. The proprietors sell delicious, healthy shakes and they are really nice people. The place has started to kind of be the local 'watering hole' during the middle of the day.
There is a man there who acts a little like what you're talking about. He is getting an exercise class together and has told all of the folks who come in, including me. I mentioned to him a few weeks ago that I told a friend about it, and she is interested. He said to me, "You mean you've decided not to come?" And the way he said it was not all that nice. That really kind of shocked me, because I wasn't trying to substitute her for me... I have NO idea how he would extrapolate that from what I said...
Later, I asked the lady about it, and if it is just ME or does he act like that with other people. She told me "Oh, he's like that with everyone!" And then told me some of the things he has said to her. So the upshot is that he is just kind of an odd bird.
Now I know why he is divorced...
Anyway, if you know you have given no cause for it, then it really is THEM and you shouldn't worry about it.
Dawn