Yes, he pointed out that I am the married one when I was asking about girlfriends. I do not believe he understands my situation, however I live in a small, rural area and very few people I have discussed it with do truely understand.
Ideally I would prefer to find someone in an open relationship too. I had someone ask me to pick between him and my husband and would really prefer to avoid that kind of drama again. Thank you all for the clear-headed perspective on this, I was trying to rationalize it and it just didn't feel good.