No, you're not wrong to feel this way. You have no romantic interest in her. This was pushed on you. You were bullied into this.
You say he's the one for you, but consider if a guy who pushes and cajoles and bullies you into a romantic, and presumably sexual, relationship with someone you don't want that with, is really the kind of guy you want to spend the rest of your life with.
The truth is, you don't necessarily have control over whether this will break the two of you.