WWhat are signs he cheating on me and it is invading privacy if I have a spy app on. My phone for his phonen and why are exes friends on facebook?

I'm scared he's contacting exes. So I check his phone every day on an app that let's it see his texts from my phone synced in. Its called mighy text app. He ain't sexted nobody yet but I THINK HE CHEATS AT WORK. SO I NEED PROOF BEFORE I LEAVE HIM.
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