My husband leaves me for his brothers girlfriend and is making out with her in a theater that my kids and I are at so I turn around and say seriously your really going to do this in front of me and your children? And he replies you better get use to it because she's going to be around a lot and is going to be the kids step mom! So I freak out on the both of them and tell her she will never be my kids mother and proceed to tell her that my husband won't stay with her that I did everything under the sun to try and make him happy and really seriously if I did everything for him and he still cheated on me with you, what make her think he won't cheat on her! What does this dream mean??

A dream!! I would say you have a little bit of jealousy going on here. For whatever reason you letting your insecurities come to the surface. You need to work on how you feel about yourself!!