cheaters and how they affect their kids

so my mom and dad just split bc my mom cheated on my dad and is still seeing the same person.I am super upset bc she has made it clear she would rather be with him than my sister and I.when im with her she spends all day on her phone and doesn't talk to me.I'm sad and upset bc she hurt my dad and I had so much faith in her and trust but I hate her now.What hurts the most is that ik she cares more about her relationship with her bf than my sister and I.When my parents broke up I just learned the extent of my parents love for me.(they r both selfish people who would rather have my sister and I out of their lives)