Advice for a bisexual married woman who just had a threesome with her husband and another woman - first time?

I've always known that I was interested in both men and women, but I had never shown that side of me to my husband until that evening. I hinted at it, but this was my virgin experience with another woman. How do I go forward? He wants to keep it up, but I don't want to hurt our relationship. Any advice would be helpful.