A topic that comes up with some frequency with my clients goes more or less like this: "We wanted to open our relationship and we agreed that we wouldn't fall in love." You can likely guess what happened. What may come into my office is: "We promised not to fall in love and s/he broke that promise! How can I have trust now?"
While I understand the logic and intention behind this statement, I also think that falling in love is something that is difficult to control since the process seems to be at best irrational and unconscious. I doubt that there is an intention or a conscious breach of trust behind someone falling in love. I think we can choose who we love and I am less sure we can choose when and with whom we fall in love. Or can we?