Partner of 3 years is falling in love with somebody else? Maybe?
My partner (F33) and I (M27) of 3 years have been ethically non monogamous for about a half a year, and there hasn't been other people introduced to our relationship apart from some short lived flings that didn't even reach the point of sex before they broke away. This has allowed us to be able to explore ourselves, to open up a new level of communication with one another, and to be really honest with ourselves.
Her and I have enjoyed it so far, but recently my girlfriend has found a girl (F23) that is "reaching parts of herself she's never had access to". I can tell this is the first person one of us is really falling for. She's pretty open about the fact that she thinks about her all the time and they've discussed progressing their relationship with eachother.
Because we haven't gone past the point of just kissing other people and exploring attraction, I feel super out of my depth, and I'm afraid she'll leave me to be with her because there are things being affected within her that she has said for a long time that I could not do.
I'm open to the process, but I have a lot of fear that she's simply going to view me as a friend before long.
Any advice on how people have navigated these beginning stages in ethical non monogamous relationships, and what happens when your partner is head over heals for somebody else?