Guys, How can I ask the commitment question?

Iv been seeing a guy for 4 months but there's been no talk of future or commitment. I dont doubt he has feelings for me we have such a good time together but i feel he wants his cake and to eat it as at the weekend he always has plans with friends. I feel like he wants me but also still live like he's single. How can i ask the question are you using me without sounding like a clinger or being difficult. And what to do if i get no straight answer which is what i feel ill get

Guys, How can I ask the commitment question?
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