I have a long term fwb amd my other female friend knows I have feelings for him and I am away on holiday today and she has been mailing him behind my back and made a pass at him. He phoned me straight up to tell me as we have a rule of do what you want just not with friends, so I'm in no way angry at him. But I'm very angry at her and don't know what to do about it tbh.
Things between me and my fwb have heated up lately and he's moved in which she knows, so just don't get why she would do this? she's recently split up with her ex and has gone through 6 relationships in the last year as she can't seem to stand staying single but there are plenty of guys out there no need to go for mine.
Btw she doesn't even know the boy apart from on rare occasions she's seen him with me maybe 6 times at most so there's no need for her to be mailing him at all like.