I've known people who struggled with this, which is why it's important to read and discern the word of God ourselves. Pastors aren't perfect, so never take a pastor's teaching as absolute. Read what Jesus said on the subject of divorce then take his word for it.
In follow-up to a popular thread trending on this site, it has been my experience, and observation, that divorce happens because the husband was cheating, or he left her for another woman. Hence the Sexual Immorality clause, i.e. the moment he joined with another woman the marriage vow was broken. That's why Jesus said if a man leaves his marriage bed and lays with another he causes his wife to commit adultery since he will return to his wife and likely have sex with her, making her an unknowing victim to this sin. After all, there is no marriage anymore. So, if divorce arrives from this circumstance then a Christian man can marry the divorced woman without concern.
Now if the husband and wife reconcile, or the husband ends the second relationship and wants to be faithful to his wife, then they must remarry because, with the broken vow, they are no longer married in the eyes of our Lord. Does the husband have to tell his wife about the affair (if she didn't already know)? If he wants to, I know I wouldn't. Anyway, a second proposal of marriage would be seen as a romantic gesture, and he should work hard not to let it happen again.
In follow-up to a popular thread trending on this site, it has been my experience, and observation, that divorce happens because the husband was cheating, or he left her for another woman. Hence the Sexual Immorality clause, i.e. the moment he joined with another woman the marriage vow was broken. That's why Jesus said if a man leaves his marriage bed and lays with another he causes his wife to commit adultery since he will return to his wife and likely have sex with her, making her an unknowing victim to this sin. After all, there is no marriage anymore. So, if divorce arrives from this circumstance then a Christian man can marry the divorced woman without concern.
Now if the husband and wife reconcile, or the husband ends the second relationship and wants to be faithful to his wife, then they must remarry because, with the broken vow, they are no longer married in the eyes of our Lord. Does the husband have to tell his wife about the affair (if she didn't already know)? If he wants to, I know I wouldn't. Anyway, a second proposal of marriage would be seen as a romantic gesture, and he should work hard not to let it happen again.