The biggest thing for me out of the season finale was the confirmation of the Doctor’s feelings for River.
There has been a lot of debates and arguments - how married are they really? How does he really feel about her? What is her role in his life? How much does she influence him? But in this moment, when he turned to her and told her he’s always seen her and listened to her, but did not acknowlege because it hurt him too much, you see.
You see how he’s hung on to her, despite his own denial. You see how he’s taken her advice to heart, even when he pretends he couldn’t hear. You see how he looks at her and touches her. You see how he kisses her, like he’s longed for her for eons.
She is his River, his beloved wife, his sweetie. He held on to her until the very end of her timeline, and will keep holding on to her until the end of his.