Barb, I do like what BF posted about your situation. Again, I'm sorry all of this took place, but at least you are now aware of what some of the issues were/are going on.
I'm glad you spoke to J about the situation. Do you think that L will return at some point? I hope so as you do like both young ladies and Ryan does too.
I don't understand the behavior either. But, in some cases, it is a way to manipulate the other person by keeping them off guard. Then again, this may be her way of getting your attention and having you validate how you feel about her. Stop and think about it, look at all she has told you about L and basically put L in a bad light w/you. I suspect that there may have been some jealousy in the mix. Whatever the reason, I would suggest you dig a bit deeper and find out what is allowable when it comes to asking them to do things for you so that you don't have another episode like this down the road.
I do hope that everything will go smoothly while you are away.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.