Could be a multitude of reasons. I wouldn’t play the guessing game with it. Have an open and honest dialogue with your partner. Don’t approach it from a negative standpoint. It should be blameless. Approach it from a purely inquisitive and want to reconnect and improve intimacy.

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he has a side bitch

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Stress

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Lower libido than yours

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He's not attracted to you anymore. He might be fucking somebody else

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There’s a plethora of reasons! It could be medical, mental, physical… TALK TO HIM instead of asking here. He might not enemy realize there’s an issue.

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