Overthinking?

I took my fiancé lunch for his birthday yesterday. He told his female boss I was coming so that she could meet me. Her cubical is a few up from his so, we could see that she was there. He Skyped her and said “im training my replacement” she said “his name better be named (my fiancé’s name) anyways... he said it was me just joking thinking she would come over. She gets up walks outside and gone for a long time. I leave and as we walk out we see her walking and as soon as she sees up she turns around 🤷🏻‍♀️I was like WTF rude!. She’s real comedic with him and honestly it’s annoying. I felt weird when I left there. They had a birthday lunch for him today and she ended up not going but said she would take him and another female co-worker out on Tuesday. I’m not going to lie, I don’t want him going with her. I just feel uncomfortable now. Opinions..advise?