I'm doubting the relationship, should I just end it?

I have been dating this guy for 3 years, we have lived together the last 6 months. We have always been happy, but lately I'm doubting it. I don't even know if he is still happy. He says he loves me and wasn't to be together but he does not give has much affection.
I'm doubting the relationship, should I just end it?
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