I have the same "problem" too, but it depends on the season. There is times that took me like 2, 3 hours to finish (almost allways with my hand), to the point where it start hurting. And there's seasons where i can finish in 30 minutes, in other hand it have occuried 3 times where i finished in like 2 or 3 rides... Don't know wtf is going on to me but i like my performance in sex, i'm 29.
Anyway, does she are mad at you just because you came and don't tell her? Idk it sounds over reacted, anyway, i hope you can fix things with your girl. And hope you can keep having sex