Why do women always lose interest in me after I become committed in the relationship?

Paradoxically, the women I've been with claimed they were demisexual and they liked having sex with me because they felt a very strong emotional connection. However, why did they sleep with me three times a day in the first months of the relationship when I was not committed and didn't want to have sex anymore after 2-3 of committed relationship? Do I pick the wrong women? Are they not mature enough?

Why do women always lose interest in me after I become committed in the relationship?
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