I just had a look at my FB. Two of the three people I've got in the top suggestions I've never had an online chat with. As it so happens, I've also blocked the news feeds from two of them (one swears too much and the other complains too much)
You're concerned that she'll think you don't trust her. But the truth of the matter is that you really DON'T trust her....otherwise, you wouldn't be here with the question.
Never regret anything that has happened in your life. It cannot be changed, forgotten or undone. So, take it as a lesson learned and move on.