Romney is the biggest douchebag there is right now. What he actually thinks he’ll accomplish with his childish temper tantrum is unknown. I think that the #nevertrumpers must have some deep dark secret that they are willing to make public to get him to humiliate himself over and over again like he has been doing.
He is auditioning for the VP slot on Hillary's ticket. If she is indicted, he is auditioning for the Democratic presidential nomination, with the intent of creating a Democratic-Republican Party via merger to stop Trump.