Sex (concerned)

My husband and I had a threesome and set up boundaries..

1. He doesn’t do anything with the other person when I’m not around

2. I don’t do things with the other person if he isn’t around

3. If we ever felt uncomfortable during the whole ordeal we had a safe word to use, that applies to the other person as well.

We her and I started in the shower together (mind you I’ve never been with a woman or had a threesome) and her and I kissed that is all. Well my husband hops in, and I told them to kiss to see if it made me feel jealous or uncomfortable, they did and it didn’t make me feel that way. So I hopped out and said be right back I’m going to grab my gown y’all can continue kissing.. then I hear moaning. My “friend” (other person) comes out and says let’s go outside and sit while he finishes showering. I said what were you moaning about and she said she grabbed his penis and he started to finger her... Am I overreacting by being hurt/upset by this? I thought we had set boundaries and they were crossed. Am I wrong for being upset? I need help and advice ladies!