[mayres]

Good advice from brookn.
You most likely did nothing wrong. I find this a particulary difficult time to keep phal blooms nice for a long period of time due to ever changing temperature conditions - no air conditioning and temp flucts from approximately 60-100 where I live.
Most of these phals come from controlled environments and then when we put them in our homes they often loose their blooms in the aclimation period. Good air movement and raising the local humidity with pebble trays and doing all you can to cut out the temperature extremes will help prolong your blooms.
Buds blasting has very little to do with the health of your overall plant - you are most likely in good shape. This may had little to do with the repot - hard to tell for sure. Most of us can repot plants in flower with little ill effect - but this is not 100% either.