Did forgetting my girlfriend's birthday ruin our relationship?

Tyler4342
My girlfriend, Sydney (of four years) is mad at me because I forgot her birthday (again I did it to her last year as well). This time she let me gave it and ended sleeping at a friend's house. To matters worse when I called her to apologize and ask her to come home I called her Cindy (my exes name).I'm horrible with names including that sound the same. She call me a jerk and hung up on me. I haven't heard her since. Are we over? I really miss her! How can I make it up to her?
Updates
+1 y
Sydney and I made up. I took her out for dinner and gave her necklace the in engraving "I love Sydney". We're good.
Did forgetting my girlfriend's birthday ruin our relationship?
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