I think that without a doubt, you need to talk about it openly ASAP. Boundaries are really important to set in any relationship, and just because your SO is a CD doesn't mean it's okay to violate your trust. Be as open as possible in the conversation...if going out w/ other CDs is really important to your SO, then without a doubt, that needs to come with whatever boundaries or limits the two of you decide. If it's not something you can live with, and your SO is adamant about make that part of his/her life, then it's something the two of you need to evaluate in terms of the long-term possibilities of your relationship. Good luck!