“But don’t you get divorced, by God! You are cut off from the sacraments for life if you do...unless you pay the mordida, that is!”
That’s completely false. Being divorced does not cut you off from the sacraments. If you divorce and remarry outside of the Church, that is a different story because then you’re nothing more than shacked up in the Church’s point of view. Once again, just to make this clear: BEING DIVORCED DOES NOT CUT YOU OFF FROM THE SACRAMENTS.
http://www.catholic.com/blog/jim-blackburn/receiving-the-sacraments-after-divorce-and-remarriage
However, having relations with someone not your spouse (e.g. the second "marital" "partner") while your original spouse is still alive, Jesus called, three different times, adultery (Matthew 19:9; Mark 10:11-122; Luke 16:18)
That's where the excommunication comes from, the second marriage: ongoing, civilly-licensed, open adultery.