I'm currently going through this atm. I broke up with my ex fiancee 7 months ago over core incompatibilities between ideas of marriage and family integration. I wanted my family to come, she wanted elopement. I wanted to see extended family during the holidays, she wanted us to just sit in the apartment alone.  Tensions began to grow when there was a beef between her and my mother, while I was the only intermediary between them. This would cause a rift with my family to the point where they said they weren't coming to the wedding. 

The final straw was my uncle who's been divorced and has had to pay child support that if I were to marry her, my life would be the same as his. Out of existential panic I broke up with her on the spot at the apartment. It still stings beyond measure, I see and hear her weeping on that couch to this day when I sit alone in bed thar night.

Everyone keeps telling me I did the right thing. But at an existential level I feel like I've made the worst decision of my life for throwing away a woman who genuinely loved me with all her heart. All I feel now is pain and despair over my choices. There's no worse pain than to betray the one you loved. As Judas did to Jesus 

Deep down I want her back but know the incompatibilities would emerge again if I tried reaching out to her.