((((((((((HUGS))))))))))))))) I dont know your situation well enough nor am I qualified to really give advice, but all relationships go through ups and downs. It's said all the time but it is a phrase that most people dont really consider and it is sooo true: Marriage takes work. You have to work at it and nurture it.
Have you talked with him about it?

I'm sorry. I hope things improve.

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Not all those that wander are lost.