My husband danced with another woman at a party until it's over when I was also there.

At a recent party which, I and my husband both attended, we both entered the dance floor together. After dancing with me for some time, my husband randomly started dancing with another old woman, (Who we do not know) who was passing him around. I waited him to come to me for a long time. When he did not I went closer to them twice. But at both times while dancing, my husband turned more to that woman’s side which made me feel neglected. Without letting other people to notice I danced alone and with the others in the dance floor. Until the dance floor was over my husband kept dancing with that woman continuously. (Which was for like an hour) This surprised me and hurt me.
Before my marriage I was so much in to dancing. I’ve been studying dancing until I stopped it since my husband did not like it much. When we go to parities we both dance together and I’ve never made him feel neglected at a dance floor, which even he never has done to me. This was the first time such a thing happened and I was completely mad at the end.
We had a terrible fight. But somehow we got back together. He said that he did not have bad intention or what so ever while dancing with that woman. And he has never cheated on me. He does not keep any close relationships with any woman, not even friends. I believe him. But I can’t get this incident out of my mind. And my husband does not take it serious. He promised me that he will never do that again. But I feel so angry and jealous when I think about it. What should I do? It is something to worry? How can I forget about this??