A few weeks ago a relative of mine told me (16m) that my (30f) aunt felt hurt that 2 years ago when I was 14 I didn't thank her for Christmas gift. For context I am the only child in my entire family so growing up I was relatively spoiled. So on holidays and birthdays I get enough gifts (which i am extremely grateful of) to where at times (though rarely) I forget to thank someone, this is never malicious just normally if I forget it's because l get another gift as soon as I'm done opening one and not realize that I didn't thank the person. But the reason I don't want to apologize comes from the fact that my last 2 birthdays she's missed. The first time I didn't really think anything of it because I assumed she was sick or something like that ,but then she also missed my birthday this year. Which I assume now was because she was mad at me for not saying thank you, but no one ever told me I didn't say thank you until now so I had no clue. If anyone told me then I would've apologized and felt really bad after but instead she held a grudge for the last 2 years against someone half her age because I accidently forgot to thank her. I just feel the adult response would be to talk to me about it so and not miss my birthday because you're mad at me. I probably will apologize to her anyways I just want to know if how I feel is justified.

Note: to all the people who think I care about the gift you're wrong, I care that my aunt whom I love thinks that my birthday isn't worth going to.