Is OTHER wrong in the post ? POST : I’m on mobile just FYI. 

I’m a M (28) and I had just gotten into a relationship with a F (21) and I thought things were great but apparently I’m an asshole for hiding my age. 

Backstory: 
I’m 28 and decided to go back to school to finish my degree. One of my classes required a group paper to be turned in at the end of the semester so at the start of the semester the professor assigned us random groups. I got paired with 3 girls. We get along great and everyone is actually pulling their weight in the group. We have a group chat set up and every time we meet up to discuss the paper everyone usually shows up. Eventually I notice a girl there, the girl in question, was flirting with me a lot. Let’s call her Kat. 

The story:
One of the girls there let’s call her “Becky” is a bit of a party animal and she had invited us to a house party her BF was throwing. We all said we’d go. I got there around 11 and Kat showed up later around 2:30. I assume she was bar hoping. She had walked in with her friends and as soon as she saw me she headed straight for me. I’m not use to women going after me because I’m average looking at best but it felt nice. We hit it off and ended up sleeping together that night. The next week we were always together and it was heaven. 

Well one day we were talking about high school and she, out of curiosity, asked me when I graduated. I told her 2009 and she looked shocked. She made up a reason on why she had leave abruptly and I was left confused and alone on my couch. Such is life. Anyways I texted her later that night to ask if we were good and after an hour of waiting she sent me a message that basically said she wanted to go back to just being friends because I lied about my age to her and she didn’t want to be with an older person. Honestly I never lied to her The subject just never came up. The only reason I knew how old she was is because her 21st was in February. It never occurred to me that my age would bother her, after all we got along so well. 

Honestly that hurt like hell. First time I’ve ever been rejected because of my age. So am I the asshole for not telling her how old I was before we got together?

Tl;dr: Girl I dated for a week never asked how old I was and when she found out broke up with me. 

