Is he using me?

Boyfriend’s been traveling for work and I had to stay home because of my college exams. Whenever I try to have a conversation with him, he takes hours to respond. But whenever he turns the conversation sexual he responds quickly (and it goes for hours) and honestly it makes me wonder if that’s all he wants from me.
When he’s home, we barely have conversations. I miss talking to him like we did before. I’m not sure if I’m overthinking but I feel used.

Note: the only reason I respond to his sexting is cause I really miss talking to him.

Is he using me?
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