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This sounds like normal livebearer behaviour to me. I wouldn't move the male unless the female becomes visably distressed, in which case I'd probably add another one or two females to divert his attention
I agree with coldmachine. Just keep watching and make sure its not a problem. I found my lone platy female (I have one male) hiding in java moss, and decided it was time to divert his attention a little. Since I got another female he's let up on her a bit. Had room for the new one since I finally got rid of that pesky chinese algae eater!