About boyfriends friend ?

[onsleek]

I'm fully prepared to be told I really am being unreasonable here .
The backstory is that when me and my partner first got together over a year ago , his best friend (who is female if that's relevant) took his phone when they were on a night out and started messaging me when she was drunk . I thought it was odd but didn't really say anything .
Another time she took his phone and changed his screensaver from a picture of me to a picture of her . I was a bit 🙄😳 about that one but again let it go .
Last week my boyfriend went to stay with her for a night and again she took his phone and changed his profile picture on Facebook then started messaging me things about how she was happy he was happy with me ect and I was pretty upset about it this time because (I'm humiliated even typing this) he has private photos and videos of me on his mobile and the background on his phone was of me in my underwear and I just felt really embarrassed that she'd seen that and had been through his photos to be able to change his profile picture .
Anyway the next day he told her to apologise , which she did but very sarcastically and she just could not understand why I was upset . Now in a few weeks he is due to be spending a weekend away with her and this is awful but I'm really not comfortable with him going . Every time I think about what she has seen on his mobile I want to cry .Aibu to feel like this ?

[YNK]

She's not a good friend to him if she's 'pranking' him in a way that might harm his relationship by invading a couples privacy then crowing about it to you!

[YNK]

Does he sabotage her relationships too?

[angryladyboobs]

No no no. This isn't innocent.

[Bluewombler2k]

Sorry if this has been said already but do you think that maybe if you are sure there is no sexual attraction on both parts that maybe she is trying to sabotage things so that he isn't with anyone at all so she is always part of his life? You say his previous gf had a problem with her too. Maybe she likes having his attention for her and her alone (not condoning this btw). Either way, DP needs to put down those boundaries and if she was a true 'friend' to him, she would want him to be happy and want to be friends with you too. I have been in a situation similar to this and it is so frustrating as you can see what is going on but OH can't. No advice with dealing with that but he needs to wake up and see what she is doing. Problem is, not everyone has the capacity to see things from someone else's point of view. Good luck OP