My best friend of close to 10 years recently told me that she and her boyfriend, who she been seeing for six years, have agreed to go down the open relationship route. I asked her if she's interested in seeing other people herself, to which she said no. It's for his benefit. She disclosed to me that she doesn't want him to feel 'stifled' in terms of their sex-life. From what she's been telling me they've been discussing issues involving their sex-life for the last 2 years. In fact they've even discussed having a threesome. As far as I can see, she has agreed to an open relationship, wary of the fact that he's become bored of their sex-life and that she might lose the relationship if she doesn't go along with this. That's what I think is playing upon her mind.
She told me about this over six months ago. Since then he is seeing someone, and to the best of my knowledge they sleep together regularly. I asked her how she feels about this and she said that it's hard to deal with but it doesn't feel wrong.
At the end of the day it's their relationship, but I do worry about my friend. She is someone who has very low self-esteem, and I hate to think she's being mugged off by her boyfriend. She doesn't want to lose the relationship and I feel he's playing upon those insecurities.
What should I do? Although I know that I should just keep my nose out of it, it's hard. She's my best friend. I care about her. I don't like the thought that she has to do this to maintain a relationship with this guy.