You cannot keep your husband from cheating if he chooses to do it however, you can be attentive to his as well as your own needs, keep it exciting, be open minded and both of you be happy and he will be likely less to wander. Guys don't like confrontation or being nagged however, you cannot allow them to walk over you as well.
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Like the previous person said above, there is virtually know way to keep any human being from cheating. You and your husband share a strong emotional connection but that doesn't mean that other emotional connections can spark outside of your relationship. I would consider a no tolerance rule, meaning that if he cheats on you, that is his loss and he can potentially lose you. By cheating, he is disrespecting your emotional connection and taking you for granted. Second of all, he has nothing to gain from having sex with another woman but have momentary enjoyment with someone that he has no future with. Once he understands that, he will realize that he should always treasure you and the bond you share because there are many in this world that aren't able to form such bonds.
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First of all, you need to find out if he is 100% cheating. If he isn't then you have nothing to worry about, because you never said anything to him. If he is cheating, you follow your gut and either call off your love together, or give him another chance and let him explain. I'm sorry to hear you think he is cheating :(
Quite simple, all you need to do is make sure that the two of you never loose the connection that made you marry him. Always talk to each others, no matter what subject it maybe. Tell him what you want, what makes you happy, and what would you make you as beautiful as the next person. After that tell your husband that it's his turn to tell who and what he like about his life, especially being married to you. If the two of you can have this connection and never loose it, you can be sure that your relationship with him will last longer...
It's important to have an open and honest conversation with your husband about your concerns. Share your observations and feelings calmly, and give him a chance to explain his behavior. Seek professional help if needed to address any trust issues or work through the situation together.