Would you be upset if you saw your husband slow dancing with another female?

Je
I just need some opinions. We had my brother-in-laws wedding this past weekend. Well a slow dance came on and I turn around to find my husband dancing with another girl about our age. I'm not talking old fashion dancing where your bodies don't even touch. It was their complete bodies pressed against each other, his hands at the top of her butt/very low back, her hands around him and one hand grabbing his neck like I would do to him, and their heads resting on each other. I am not sure if it's my hormones getting me upset, but I find it very disrespectful that he would dance with her instead of asking his pregnant wife. It just seemed to bay way too intimate of a moment for it to happen with someone other than me. He looked at me while dancing and I just glared at him. Later when I tried to tell him that it hurt to see that he just kept telling me "it's not a big deal, it's just dancing." Well holding each other like that it not just dancing to me. Even if he had no feelings, you never know what her intentions were. Would this upset you too? Please explain. 

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