One of my friends is spending too much time with his girlfriend. I feel like I should tell him that.
Why would you tell him that?
My friend is too nice to tell him that, I think.
It's wrong to dictate how someone uses their time. You should stay out of their business.
What? It's his life, I'm just concerned.
Maybe you should tell him you miss hanging out then. If you phrase it that he's spending too much time with his girl he may take offense and it could damage your friendship.