Hi Tasha,
First of all, welcome to Orchidboard!
I don't think there was/is anything wrong with your orchid (a Phalaenopsis). One month is not long for the blooms, but you also have no idea how long they had been open for before you purchased the plant, and sometimes the difference in environment (from greenhouse to store to house) makes the blooms wilt early. And usually once 1 bloom wilts, the rest follow shortly after so I wouldn't blame it on repotting. Blooming phals can usually be repotted without affecting the blooms.
A few dead roots is nothing too unusual or worrying, and the yellow leaf was probably natural aging if it was a bottom leaf. In the future, it's best to let yellowing leaves drop off by themselves, and avoid spraying h2o2 on roots, it can be quite aggressive for them. Imo the only place to use h2o2 is in the crown of the plant to stop crown rot.
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Camille
Completely orchid obsessed and loving every minute of it....
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