Is AUTHOR wrong in the post ? POST : First off, on mobile so sorry for formatting/spelling/grammer

So last night I was txting my best friend, lets call her K. We currently work together at the same store, but she is an advocate and I a manager. Due to unrelated corporate issues, we are both currently putting in applications elsewhere with the understanding that neither of us is expected to stay at this job for the other. 

She txted me last night because she had found a job listing she was interested in that she thought she might have an in with due to a mutual friend (M). As I am a closer friend to M than K is with M, she asked me to ask for the referral for her. I told her I would be willing to do it, but that while I had no doubt M would follow through if she agreed, another mutual friend (E) (who is also closer to me than K) had applied for the same position and asked M for a referral as well a few tears back and the manager ended up giving E the run around.

K then proceeds to wonder if E would be upset at her applying for the position since he didn’t get it, and I told her that I am 99% sure he wouldn’t mind given how long ago it was, but that if she was worried to txt him to let him know you are applying. 

K proceeds to tell me she just won’t tell him at all and goes ahead and applies. Now, this didn’t sit well with me mainly because in the past she had tried to set up E with a mutual friend.....only to sleep with and then start dating the guy she was setting him up with before they had even met a second time. At the time I explained to K that while she is very important to me, that I would not tolerate her acting so underhanded to my friends who are equally important to me, and that she had handled the situation extremely poorly. She understood after I explained it to her and apologies where had and things are (mostly) ok now. 

Anyways, due to what happened in the past, the fact that she had expressed that she felt she should ask at least tell him, and then intentionally did not even though I have every confidence it wouldn’t be an issue with E, I flatly told her she was an adult and could what she wanted-but the whole thing felt underhanded. And reminded her she had already fucked over E once. She understood and just shot off a quick txt to him letting him know what she had done, and surprise surprise- he didn’t mind in the least.

No one has told me I was an asshole in this situation, but I also kind of feel like I overreacted a bit. I can be a bit overprotective of my friends. Also, I feel if she hadn’t specifically said she felt she should tell him and then specifically did not out of fear he would be upset by it that it wouldn’t even be an issue.

So, AITA?