If I were Trump, I wouldn’t trust Romney for a split second. Hopefully, this meeting was just for show. Romney WAS the candidate the last time around, and said some truly awful (and untrue) things trying to derail Trump’s campaign - this show of solidarity surely can’t hurt Trump. There’s plenty of GOP-e slime out there he still has to deal with, and it looks good to the public in a more general sense as well. If the worst he had to do for this is shake Romney’s hand, I guess I’m glad he did it.