First, phals do not always rebloom from the same bloom stalk. So don't worry about that. Cutting off the good leaf is always a bummer, but the plant should be able to survive. So limp leaves is usually a sign that the plant is not getting enough water, and there are two reasons for that:
1. You have been overwatering and the roots are rotting (Most common)
2. You have been underwatering and the plant is thirsty.
So - get some fresh potting material, then unpot your plant and look at the roots. They should be either green or white and very firm. If they are brown and soggy, they are dead and rotten. Cut off all the dead roots, dust the area with rooting hormone and repot. If there are no live roots left, you can try to salvage the plant using the sphag and bag method.
Check out the roots and let us know.