My dad has been texting another woman and both my mom and I know about it

Anonymous
so my dad has been texting another woman for a few months now. she is married with children and obviously so is my dad. both my mom and I know about it, and when I confronted him about it he put a password on his phone and deleted all his text messages. he insists there is nothing going on and gets really defensive when you mention it. but I see my mom is hurting and she has learned his password and sometimes will sneak onto his phone because she just cannot trust him. he has done this before in the past and it completely ruined my high school years. everyone found out about it and kids were awful to me. it kills me that he hasn't learned his lesson and thinks he is invincible and that he is doing nothing wrong. I have even confronted this other woman and told her to stop and that if she didn't I was going to tell her husband. they text all the time and even say good morning to each other through texts. I am 24 years old so I am not a kid anymore I'm not stupid or naïve and I am extremely protective of my mother and I hate my father for doing this to her and my family. I don't know what to do. any advice?
My dad has been texting another woman and both my mom and I know about it
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