Answer: Some clematis bloom on the old vines that grew the year before, or late in the season on the current growth, so the pruning may have limited the blooming for this year. It would not have killed the plant, however, so do not blame yourself. Clematis are subject to a number of disease problems incuding clematis wilt. I would suggest you work with your county extension to try to determine what is affecting your vine and once you know that more specifically, work from there. In the meantime, you could top dress with some good quality compost and clean up and remove any fallen or badly discolored foliage and faded blooms in case it is something such as a fungus that could reinfect that way. I hope it is nothing too serious.
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