You hoped that for one day, Jay could be able to spend time with you, on your anniversary. However, Jay texted you the night before that he wouldn't be home on your special day or the following two days, without acknowledging the significance of the date. You felt disappointed, forgotten and even more upset he didnt invite you to his game, the one that would determine his spot on the NBA scouting list.
Jay completely forgot about the special date because he was too focused on his packed and stressful schedule. He didn't realize his mistake until later when he checked his shared calendar with you. He felt bad for leaving you by yourself. He didn't even invite you to his game as usual. Likely Jay either forgot, or thought he'd mention it before.