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Ill explain what you already know (maybe cant see?)
From your post, im guessing SHE is your "friend" and her BF is just an acquaintance to you.
Why the hell would you go shopping with her? especially when shes taking her BF. You and her BF are both acting like *******.
You're feeling the way you are because in reality you were wanting to spend time with her and got 3'rd wheeled because her chump BF was there. Otherwise you wouldnt have given a sh!t, but it bothered you anyway. There is a reason for that, only you know answer to that.
ONCE, one of my friends pulled something similar on me. HE dragged me along with him only to watch him cater to this b!tches every need like hes her servant. While I was stuck as 3rd wheel, watching this... what can best be worded as a pathetic, thing. This shit lasted for 5 hours, and yes I came close to killing them both just to put them out of their misery //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif
I cant stand shit like that, and havnt really hung out with him since. Its a level of respect lost thats hard to recover in my eyes.
Just man up and move on, screw this "friend" of yours. I wouldnt EVER put one of my friends into a position to see things from what you experienced, or what I had to experience. Regardless of which one it was, be it her or him. Pull your head out of your *** and move on. Someone who does that to you is not your friend & obviously doesnt respect your time.