Although it may be difficult, do your best not to engage with your spouse’s ex. Endeavor to keep past events in the past, and avoid being drawn into your spouse’s past issues. It is a good practice to pursue peace. Prayer is a very important foundation in the success of any marriage or remarriage.
It is also your responsibility to exhibit unconditional love. Don’t speak negatively about your spouse’s ex, especially in front of the children. And be a good listener when it comes to supporting your spouse.
“And let the peace (soul harmony which comes) from Christ rule (act as umpire continually) in your hearts [deciding and settling with finality all questions that arise in your minds, in that peaceful state] to which as [members of Christ’s] one body you were also called [to live]. And be thankful (appreciative), [giving praise to God always].” (Colossians 3:15).