present tense

We talked for another couple minutes. By the time I hung up, he didn't sound mad anymore, but I could barely move. The effort to win him back, to find the right words not only to convince him that I hadn't overlooked him but also to reassure him that I was appropriately grateful and enthusiastic had drained the last reserves of my energy. I don't remember getting into the car or the ride home or whether or not I said hello to John in the lobby of my building. Besides a bone-deep exhaustion that hurt so much it almost felt good, the only thing I remember feeling at all was relief that Lily's door was shut and no light peeked out from under it.

Why the underlined words are in the present tense while the passage is in the past tense?

Thanks!