BDO Intern interview questions

It was on campus and pretty chill. It was conducted by a director and a senior associate. The associate lead the interview, even though he was way more nervous than me. The director was pretty laid back and chimed in occasionally. But I liked that they had an associate lead the interview. They both seemed to love me, and I loved them. Everything seemed fantastic on both ends, so I'm puzzled about the fact that I never got a 2nd interview, and why it took 4 weeks to finally get my rejection email. Maybe it's because I didn't follow up the next day. I guess I have to do better next time.