How can I tell if a man wants a relationship with me. He calls me everyday but sometimes talks about sex?

This guy I've been talking to told me he is looking for a serious relationship and has talked to me about his personal problems. But he also talks about how he wants to make out with me and about having sex once in a while. I dont know if it is because I am extremely sexy and only wants sex, or if he really wants to have a relationship with me.

How can I tell and what should I do or ask to see whether he wants a serious relationship with me?

How can I tell if a man wants a relationship with me. He calls me everyday but sometimes talks about sex?
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