I'd have to say you did break the law per the officer's judgement. He saw you as slowing down enough to not be 'reasonably safe'.
Quote:
IC 9-21-8-24
Slowing down, turning from a direct course, and changing lanes; performance with reasonable safety; signal Sec. 24. A person may not:
(1) slow down or stop a vehicle;
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The only problem here is reasonable is always up to whoever's judgement at the time. You see it as reasonably safe because you were looking out for traffic and being mindful of the situation. The officer can't know that, and if I were him I wouldn't assume you were doing that knowing how most people drive.