You may not be able to change your husband’s mind – but God can, and that’s why the most important thing you can do is to pray for him. Pray that he will see the wrongness of what he’s doing – and the foolishness, as well. The Bible says, “The prayer of a righteous man (or woman) is powerful and effective” (James 5:16).

After all, what your husband is doing is wrong, not just in the eyes of other people, but also in God’s eyes. When you were married, you both took a solemn vow – not just before other people, but before God – to be faithful to each other as long as you both were alive. That vow is often broken today, I know – but that doesn’t make it any less serious. Jesus said, “Therefore what God has joined together, let man not separate” (Matthew 19:6).

But I also urge you to pray for yourself, and for your attitude. Don’t let bitterness or anger overwhelm you, and don’t give in to depression or feelings of failure. Instead, turn to Christ and ask Him to give you the strength you and your family need during this trying time.

Your husband is living in a fantasy world, deceiving himself into thinking he’ll find lasting happiness this way. But relationships like this seldom last, for they are built on an unstable foundation. May God convict him of his sin, and eventually bring your family back together.