I very rarely believe that whole "she's jealous of you" nonsense. That is something we all heard growing up when someone picked on you or didn't like you. The truth is- they weren't jealous. They just didn't like you.The husband chatting with the OP is not a big deal to me at all. My own DH will make polite conversation with people and I prefer to keep to myself if I don't like someone.
It doesn't make me jealous. I just have less tolerance sometimes.
Honestly- if the OP acted this nutty over and invite I can totally see why they weren't invited in the first place. YMMV.
I agree with everything you said.