This actually sounds more like trodezii to me. And the "tu" does sound like "tum" or "tu-mi" on the slow pronunciation.
I am sitting with my Romanian teacher and we both cannot understand the pronounciation
First, the sentence does not sound like a question. Secondly, on the slow speed we hear ”Tum mă trădezi”, instead of ”tu” and without question intonation. I reported it.