"X, my understanding was that you wanted the family back together. I would be open to exploring that, starting to date a little, seeing how it works, but only when you are genuinely free to do that. We could begin while still dating others or not, that would be something to decide. But right now you aren't just dating, you have a boyfriend are in a committed monogomous R. You aren't single. As for being "just friends," right now that is not something that works for me."
Of course, if you are open to friendship now, you could instead say:
"X, my understanding was that you wanted the family back together. I would be open to exploring that, starting to date a little, seeing how it works, but only when you are genuinely free to do that. We could begin while still dating others or not, that would be something to decide. But right now you aren't just dating, you have a boyfriend are in a committed monogomous R. You aren't single. So, we cannot date now. On the other hand, if you want to be "just friends" I am open to trying that too. But I should also be a friend to your R, or I would be uncomfortable. Perhaps the three of us could have lunch? Once everything was clearly above board, I think there would be more space for friendship."
