Dh and I have been married for 5 lovely years and we have Bd4. I'm also a Sm to his twin Sds16 and Ss14. The kids and I used to have a great relationship until the following incident. 

Bm has been trying to win him back ever since we got together. I was not the cause of their divorce. She ended up cheating on Dh with one of his close friends at the time. This really hurt Dh. Luckily Dh never replied to her text messages, e-mails. The keeps interactions with her to a minimum and only about the kids.