I made a rather stupid mistake: when I received an offer from my dream company and accepted it I was already in the interview process with another company.
About 1 week after accepting the offer, I was called by the other company and told that I am invited to the final interview.
I thought this is a good way to practice my interview skills and accepted it, even though I already took the offer. So, I went to the interview and (I think I) nailed it. At the end, I was asked if I have other offers. I was rather scared (but didn't show that) so I said I have an offer from the other company (and told the company's name), until next week. They asked me what it is about and I told them. They said that I will have the answer from them by then.
I didn't realize that I might be burning a bridge and now I don't know what to do. Will they talk to the other company about the offer?
To worsen this, I found out that the recruiter lead at the company from which I have the offer is a former boss of the HR person I met at the final interview. Even more bad, these are world-level companies.
These are internship positions in software development (I'm still a student). I don't even know why I said that..
What are the chances for this to backfire at me and what can I do about it?
LE: I was told by the technical interviwer that I will most likely receive an offer.