Why would a guy not want sex?

I’ve been dating him for months now. We started off having sex but then we stop. All he wants now days is oral sex. Its the weirdest thing because I’m use to guy just wanting sex. But him no. We sleep in the same bed. I mean we are pretty much doing everything but sex. We recently purchased a car together. He wants me to quit my job and work for him. He calls me babe, my queen, and baby. I met his friends, Im around his kids. He pays some of my bills. But no sex it drives me crazy. I’ve asked him why he doesn’t want sex. I even told him it won’t hurt my feelings if he’s not into it. I just need to know. He refuses to give me an answer. Why would a guy not want sex?

Why would a guy not want sex?
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