Believe the words a man tells you; that he loves you, that you are unlike anyone else in his life, that although you aren’t going to be intimate anymore he doesn’t want to lose you in his life. Believe he can’t possibly be so deceitful that he’s letting two women think the same thing when it comes to his love and commitment to them. Justify staying intimate with him by telling yourself she can’t possibly believe he’s romantically in love with her.
After you break up for the final time, spend a fair amount of mental calories debating whether to block him from contacting you. Believe he will be the one to reach out. Think about ways you need to be strong to get through the breakup without reverting. Believe he will be the one that suffers more in your absence, than you in his. (Note: this is perhaps dangerously close to hubris)
As you are washing the lingerie from the last two nights you had together, just one week before, demonstrate a common-yet-unfortunate inability to stop looking at the Instagram account of him and his was-ex-but-not-anymore wife.
See on her Instagram account the first couple selfie of them since 2012: seemingly happy faces pressed together, him wearing a Halloween costume the two of you talked about having sex in, with a “love birds” hash tag and other romantic references.
Feel the cleaving of your heart as things you believed to be true are called into question. Remember vividly your anger is an iceberg. Realize nothing you would say to him that moment will get result in any peace.