Yes and yes. There are tech problems and there are people problems. People problems are harder.
Or do like I do with my husband. Stop checking his phone. Let him have his privacy, allow him to associate with females as friends and co workers. And know that this climate of trust makes a healthy ecosystem for mutual caring and love. People cheat usually because they are unfulfilled, curious or unsure of their standing. Being paranoid, invading privacy, accusing and trying to block them from social situations solves none of those. It's manipulative and controlling...
...And a bit of a pet peeve of minealso, wasn't that like 2 iOS's ago?