Why is partner always accusing me of cheating?

We’ve been together for years
And now we have a baby
So i stay home everyday with our baby while he goes to work 5 days a week

he's always accusing me of cheating
And inviting guys over to our house while he's at work
But there's no proof/evidence

I have never cheated in my life!

Why is he always accusing me?
Why is partner always accusing me of cheating?
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