Note: I am pretty new to RP, so any critiques are welcome.

I am in a LTR with a girl that agrees with many of the RP rules and knows her place in the chain of command. We've been together 2 months and are still getting to know more of each other.

So i had the chance to go to a cabin in the mountains in another state with some friends for a long weekend (fri-sun), i told her there will be radio silence. She makes some puppy faces but i don't flinch.

Friday night, i get a messsage:

"If you find a cute girl bring her over for a threesome! Haha! Just kidding" [note: We talked about sex fantasies and i told her one of the strongest ones i have is a threesome, she is completely against it but i always joke about it so she knows it's allright to be playful like that]

After i get back, we get together for a date and i jokingly tell her about the message, then she replies out of the blue (in a half serious, half joking tone):

"I wasn't worried at all, i know that you would get back to me anyways after you were done with her and the trip" ["her" being an imaginary girl i could have met during the trip]

So there it goes, straight alpha-sharing, of course this being a LTR, she is consciously against me being with another girl, but i can only think her subconscious mind surfaced that as a possibility and that is her mind adding some rationale into it.

We talked about this and what i could muster from her reactions was that:
1) At first she was speechless and seemed to agree that somehow she tought about this without thinking.
2) She is completely against me meeting other girls, but when i asked her:
Me: "What if we weren't in a LTR?"
She: "If that were the case i think it might..."

TL;DR: I didn't believe in alpha sharing but the girl i'm dating for a LTR suddenly seems to be ok with the idea if we weren't in the LTR.