My (F21) boyfriend (M21) makes an effort to hold me responsible for his younger sister’s “happiness” even when I set clear boundaries.

Long story short, his sister and I don’t get along too well. She’s protective, don’t get me wrong, but I do believe that does not give her a reason to be directly rude to my face, which she is. I have always stood down, but have recently made it very clear to my boyfriend that I want to draw a line that can’t be debated upon; I will not actively
choose to engage with his sister, unless it’s detrimental that I do.

With that being said, he posted a picture of us together, his sister commented a compliment directed towards me, and is now upset that I didn’t respond to her comment. My boyfriend comes to me and tells me she’s upset with it, and he then continues to be upset with me when I tell him I didn’t even have the time to see that comment. Anddd boom, silent treatment from him.

Most minuscule thing that we could possibly argue about, especially considering I am in now way responsible for his sister’s happiness, and pretty much just had that line I drew crossed.

I have no idea what to do! This has been a running theme in our relationship which has been going for 4 years, where he wants me to do certain things, or behave in a certain way that I am not comfortable with, just so it would satisfy his sister (and his mom :/) I’m at that point where I’m sick and tired of it, but have no idea how i should go about communicating that to him. Any ideas?