Re: Monogamy
Sure, there is nothing “preventing” him but is he is someone of faith or values the sacredness of the relationship then he most likely won’t step out. There’s a certain level of trust you need to place in your spouse that they will not cheat. If they do, then you’ll have to decide next steps, etc. You can never control the other person but you can decide how you want to live your life, how you want to deal with different situations and know what you value, are willing to tolerate and set your personal boundaries.
Also, most people choose not to step out because the consequences are more troubling then the act of cheating. Ie. someone might know their spouse will leave with the kids, house, etc if they do cheat so they would rather stay faithful then have some side fun and deal with all that.
Others are very religiously/ cultural/ morally conscious and would never sacrifice their values and thus control themselves.