I think my dad is cheeting on my mom because he is working late and gets text messages and won't let anyone see and he reads them outside alone a lot he is always grumpy and just acts so secretetiv around everyoone can help me find out if my dad is chetting on my mom please.

This is none of your business. And if you talk to anyone about this, it should be your dad. There are other explanations for what you think might be going on.