What makes guy commit to a relationship?

Anonymous
So i've known this guy for a month, and we have sex almost every weekend. And the sex is amazing. I am also trying to have good communication with him. Short conclusion, i like him a lot and want us to be exclusive. But everytime i brought this topic up, he will say that he needs time.

So why he needs long time? Is there any other thing I should do to make him sure for commitment?
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What makes guy commit to a relationship?
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