so stressed

I can't eat I can't sleep I'm a mess... I'm constantly feeling inferior to my fiancée ex wife.... she's a terrible mom and person but yet he still kissed her when I was going through the worst... I trusted a man for the first time ever and I feel like he burned me. I'm so scared and stressed out about her being a direct threat to my relationship. I'm so depressed. I tried to get him to listen to my pain but he wouldn't so I cut myself open on my arm. It got his attention but I can't help how I feel.