*** “Trump fights to win, and sometimes I think he feels remorse for what he has done in order to win, especially when it was unfair, and especially when it was to a decent man like Cruz” ***
Might be some meat on that bone also might be more complicated
It's probably not any one thing, but I am confident some of it was an effort to mend fences. I'm sure Donald invited him, I don't see him going there without an invitation.