Seriously. He says that he strongly regrets going so hard after him in the last few days and especially during his campaign launch. He also claims that Jeb takes his campaign very seriously.
He also said that as president he would want to negotiate with ISIS and that he sees Jeb as a bad ISIS negotiator. I didn't know that it was common to negotiate with terrorist groups who'd want your head on a plate LOL.
http://thehill.com/blogs/ballot-box/gop-primaries/245574-trump-regrets-being-too-rough-on-jeb-bush