I took it as simply illustrating their relationship : Danny is the one who initiates things, but boy does he need Mindy to take the second step. So it makes sense that she does not give up on him as easily - bear in mind that for Danny who does not express his feelings well at all, his actions in this episode can be…

I thought it had more to do with Danny being completely certain that she would never show up + his absurd pride (I don't care, I'm having pizza who needs lurv anyway) + classic Castellano autosabotage