what I want to say to my mom

I want to start this by saying that I need genuine advice. My story is long but I need help. I'm active duty marine corps stationed thousands of miles from home. In March of 2015, I had to have an appendectomy so my mom flew from Michigan to take care of me. While we were in the hospital, my mom met one of my gunnery sergeants (basically a guy with a lot more rank than me that was one of my bosses). I'll back track a little and  say that I came from the perfect family. My parents were happily married for over 20 years and I was unbelievably close to both of them. They honestly were my best friends (my dad would've came as well but my younger siblings needed to be watched and couldn't miss a week of school). Fast forward to a few weeks later. My mom went home, I went back to work, life should've been normal again. But nope. My parents started fighting BAD. The gunnery sergeant (gunny) started treating me differently at work. Like giving me special treatment and constantly making sure I was okay (not normal for his rank to do) and I started catching onto the fact that he and my mom were still talking. Totally innaproriate considering hes in charge of me and both of them are married with children..come May of 2015, my mom filed for divorce and the next day my dad killed himself. I deployed two weeks later. I was still working under the gunny. On deployment he started making comments to me like "your dad killed himself so I could be your new daddy." And "you're the reason I met your mom. You're the reason your dads gone." AS IFI DIDNT ALREADY KNOW THAT. A year and a half later and I saw my mom for the first time today. I'm eight months pregnant (she knows though. I told my brother who told her) and I couldn't help but shake. The sight of her disgusts me. She came up to me and my husband and pretended that all was fine and dandy and she hasn't done anything wrong. WHY COULD I NOT TEL HER HOW MUCH SHE HAS RUINED ME? How she tore my family apart and it doesn't phase her one bit. Should I send her a text or no?? I don't know! But it's killing me to let her make me feel so small.