me and my partner are open about who goes on dates with whom. not for a sense of control, or even trust, just because we like each other and are interested in each other's lives. And if they completely forget to tell me, not a big deal. she is not my property, I'm just happy to share time with her whenever she wants to be with me. Just like friends, you don't tell your friends when you hang out with another friend and what you do with them. you might if it is relevant to the conversation or they might care. but witholding that information isn't lying by omission. all those rules you are bringing up, aren't rules you and your partner decided, those are default social rules enforced by religions and the state and comes from medieval property laws. you should sit with your partner and decide what your relationship should look like. even if neither of you want other partners, having that conversation and critically questioning monogamy would be a healthy conversation.