In long-term relationships, partners' sex drives are bound to get out of sync from time to time. That's normal and not a cause for concern unless it becomes a persistent issue that starts putting significant stress and strain on the relationship.
As a starting point, look at this as a couple issue rather than a problem specific to one partner. When partners start blaming and shaming one another for wanting 'too much' or 'not enough' sex, it doesn't lead anywhere good.
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