I'm an internal employee and I think I'm being passed over for someone external despite being more qualified.

Background: I've been working in a 6 month internship for a company and team I have really grown to love. The job I do is basically the technical side to another job which is more customer facing. It is nearing the end of the internship and a job comes up for this adjacent team. I am very well qualified because I know the entire technical side, internal applications we use, and the team very well. I have additionally helped solve a lot of issues for this team when they've been under some pretty tight deadlines. There are 2-3 openings and me and another intern are applying, so realistically we could both get it.

I finished the interviews on Monday and she found out on Tuesday that she is moving on to the last round which is with the CEO, a quick talk and then he gives the "ok" type thing. I was told I'd find out by Friday and have heard nothing. I'm feeling pretty insulted because I have continued to do extra work for this team that evidently won't hire me it seems. I know the job better than the people currently and would need virtually no training to move into the position. Putting me on the back burner like this feels like a slap in the face. Could this be that (even though I thought I got along well with everyone) that they don't like me personally? Should I talk to my supervisor about it? Why would they have reservations when they have seen me do extra work for them and do my current job well? They just let someone go that was not good at the technical side of the job and I would have no issues with it, wouldn't it be riskier to hire someone external cause you don't know how they are going to do?

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