I think this is the key issue: he can cheat if he wants to, and no amount of threats, or monitoring will stop him. You might catch him later, but you won't stop him. The only think to do is find out WHY he cheated. If the reason remains, then he is very likely to do it again. If you can take the reason away, then he won't.
I don't see any point staying in a relationship with someone you can't trust and who you feel you need to monitor.
"punishing" him, for example by making him quit his job will just push him further away and be more likely to cheat again.
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