I Hate Being Married to a Twin!

My husband has a twin brother and I absolutely hate it. My husband and I have been together for almost 8 years and married for almost 2. In the beginning, I didn't mind the twin thing and thought it was cool. However, his brother and I have always had a tumultuous relationship. The last straw was recently when I babysat his kids and instead of saying thank you, he decided to talk crap about me. So at that point, I cut him off completely. I don't speak to him, and avoid seeing him in person. This puts my husband in an awkward situation, but sometimes I don't think he really cares. If I call my husband and his twin calls him, instead of telling his twin he'll call him back, he puts us on 3-way and carries on a whole other conversation with his brother, leaving me in the background. Instead of him coming home so we could spend what little time we do have together, he'd rather spend it with his brother. My husband just turned down what would've been a good job just to work for the same company as...you guessed it. His brother! On top of all this, I'm almost 6 months pregnant with our son and have been so emotional at the mere mention of my brother in law. I honestly have no idea why, but whenever my husband mentions him to me, I just break down crying. I feel like I seriously loathe this guy. But what can I do? He's my husband's twin. They've been together since birth. I don't know if it's codependency or what bit I want my husband to grow up and stop putting his brother before me and our baby. Does that sound harsh? I don't mean to. I'm just sick and tired of my brother in law. Any advice on how to deal?