The only "explanation" is that the person is not thinking clearly, because normal people don't behave that way.
Us LBS's need to keep remembering this, such a simple line with a big message.
ME:51 W:46 M:25 S:22, S:20 Divorced 16/9/15 BD 10/12 W left 12/12 with OW, affair confirmed Nov/12. Dark since 6/13 I"m in a new relationship since Feb 14.
