How do you know and what to do?

I have been talking to a guy for over a month and a half now. We have gone out a few times and have had sex once. I am not sure if he is really into me because if sex or trying to get to know me and see where things go. We talk almost daily, but sporadic through out the day. We are not exclusive, but I would like to be. How can you tell if he is just into sex or is trying to see where things go?
I want to know, but don't want to push, any ideas?
How do you know and what to do?
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