At the thought of Axel comforting Talia, Damon was torn that someone else supported his mate, because of the stupid thing he did.
Sure, at that time Damon didn't recognize Talia as his mate, but the emptiness he felt when they were apart should have made him stop and think about what was happening. Only Talia could fill the gap in his chest that was shaped so that she can fit in there perfectly, and if he was not a stubborn mule, he would realize that regardless of the mate bond.
Damon held Talia tightly as turbulent emotions shifted and changed, the happiness of their reunion and her holding him mixed with grief and sadness that cracked his soul because he was a complete asshole. Can he ever fix all the wrongs he did to her?
The mental image of Axel and Yasmin celebrating their union with magic and witches was a painful reminder that he never acknowledged Talia in front of his people.