A Story of Me and My Fiancé, Who Became a Devout Believer After Being Saved by the Saint When He Was Young, While I Could Only Endure

I'll just quietly cancel the engagement and get engaged again to someone more compatible. Of course, it's not getting back together with the ex. The protagonist is actually talented in a cheating sense. The comeuppance is quite subtle, just a light touch, but it's an ending that makes you want to say "serves you right." I'm also posting this on Alphapolis.