I was cheated on by my exhusband.

Now 4 years later my boyfriend and I are having problems ( I posted in the dating section) but he's lied to me about various "minor" (marijuana use, emailing an ex-girlfriend in another state, going to a bar instead of working) things in the past and now I've foud myself checking his cell phone every so often for messages or pictures or saved phone numbers that indicate anything suspicious.

How can I stop snooping?