Should I contact the manager of the team again?

Hello guys, I am writing here to ask a suggestion. I was in an interview process and something happened. I will not go into details. Just to make me understand.

I live in Europe. I have been contacted for an intern position in a European bank, which was opened in a country different from mine.

1 - I passed the HR phone interview and I went to the next step 2 - I spoke on Skype with the manager of the team I should have joined, I would not even define it as an interview. He was very friendly and we had kind of a friendly speech. He said it was difficult to evaluate me from Skype so he would prefer me to go to the headquarter in my country to meet the team on charge for my zone. 3 - He set me an interview, I went there and everything was fine, they made me some questions, I answered perfectly to the technical ones, it seemed ok for the general questions. 4 - I wrote him after a week to know how the process was going since I had received pretty nice feedbacks from my interviewers. 5 - He wrote me an email saying I had to attend an interview with Personnel and few second after I received they called me. It was the same interviewer as the first step, who made me the same questions, so I felt a bit confused and at the end, I pointed it out to her, but she seemed not understanding me.

The point 5 happened around one month ago, since then I did not receive any email or call from them.

I did not write him again because: - Firstly, I felt a bit bullshitted. I mean how is it possible I passed the first interview, I had to lose time and money to reach the place where they made me my last, and at the end, I got refused with the same interview I had in the first time? Couldn't they just refuse me at the beginning? - Secondly, I had my last exams of my bachelor and I wanted to concentrate on them in order to graduate on time and with a good grade.

So now that I passed them and I am graduating in a few days, should I concentrate on something else, or should I try to write him back?

Thanks in advance