Here's what we do know:
- Bella has admitted to "being intimate with a friend" before
- Jill is Bella's only known friend
- Bella reacts strangely when in bed with Jill
- Both Bella and Jill acknowledged that something happened between them that they agreed not let happen again
What exactly happened is up for interpretation, but there does seem to be a bit of tension in the air between them
because they're in bed together, and if it's not the result of some kind of past intimacy then this will be the biggest red herring ever because there honestly doesn't seem to be any other reasonable explanation for it.
it is the first time that I see the situation in this way
I am convinced that the reference to that thing "that was not to happen again", was some interference by Jill in the question of Bella's husband (she had asked her questions about him, or she had tried to contact him etc)
the fact that Bella says she hasn't done / felt certain things for a man for a long time doesn't mean she did / felt them with a woman
two people with an erotic tension don't do Joga together, touching and rubbing.
also it would be yet another strain on Jill's behavior, an event completely out of character as she has been described so far
in my opinion this promiscuity is a DPC joke to the players
I am one of those who sees the triangle with Maya and Josy very complicated (a trap), with a very high probability of exploding and doing damage.
the one with Jill and Bella would be even worse