This does happen sometimes - I've had months without dancing before now, purely because I didn't feel like going, and I've always gone back and ended up being more enthusiastic than ever.
Two things that can help (for me) - one is the break you mentioned, and the other is to find something new (in the dancing sense) - learn a different discipline (and not necessarily even a partner-dance one)
The worst thing (probably) would be to keep on doing something you're not particularly enjoying, in the same manner, without changing anything. That way lies madness.
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