How do I handle jealousy of my ex-sister-in-law?

Your jealousy is an easy excuse you've made for the poor choices you've made in life. Look, I'm not trying to be hard on you, but the way I see it is, if you have no one to hate, then what do you do with all that resentment? It sounds to me like you've found someone to despise to mask your own misery. It's not her fault your life turned out the way it did. You don't have it as bad as you think. So you got divorced? That's about half the population that gets married. At least you have an education and good children under your belt. For all you know, she's miserable. Money doesn't buy happiness. She has what looks good on the outside, but you don't know what goes on behind close doors. For all you know this woman has put up with a lot of crap from her husband just to maintain that lifestyle. Many successful men are also jerks who hold that kind of stuff over their wives heads one way or another. There's a price to pay for everything in life. And even if their marriage is successful, how does that change your situation? It doesn't, you're just holding yourself back from being happy. I don't know if you're religious at all but one of the ten commandments says do not covet thy neighbor. This means that it's wrong to wish for what someone else has. Whether you are religious or not, there is something to learn from this. It does you no good. Work with what you have. Don't live the rest of your life feeling bitter. You married the wrong person. This was your choice and no one elses. It happens to people. It happened to me. But I'm not going to live my life looking back because it does me no good. You still have a shot in life. Don't ruin it by focusing on the wrong things. I know you are still hurt about what your ex did to you, but this has nothing to do w his sister. And if he's such a jerk, then she's probably one too since they grew up together. Why be jealous of someone with such a sh*ty personality? Material things mean nothing once you die. What matters is how you lived your life. Happy, or miserable. Make the choice.