Why are my iTunes songs greyed out on iPhone?

I have a similar problem Apple is just greedy I think I was on a chat with a guy called Jacob who told me to sign out of my wifes iPhone in setting - my name -*media* (this didnt show up anywhere) and sing out I started to reply and he cut the chat and sent me a review which I answered honestly. Then I came on here and see no one has had the manners to answer you. Quite frankly disgusted with Apple. I have always sang their praises have always had iPhones since they came out, iPad and iMacs , very disappointed . I was thinking of just uploading my music to my wifes phone well the albums she likes. but reading your question looks like that wont work either good job we still got a cd player at least they cant interfere with that. You see it seems like amazon and apple they just want your money, and dont give 2 hoots about you.