Agree with ES that you can't determine virus without a test. But those makings on the flowers are suspicious. But other things (like insect damage) can also leave marks on flowers. If you can't test, I'd suggest isolating the plant. If it blooms like that the next time, then that increases the odds that it is.
Since the plant isn't thriving, also an indication that it could have virus. And yes, virus is incurable. Along with isolation, handle this plant with care to avoid spreading to other plants (sterile tools, gloves, protect surfaces with newspaper, etc)
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