How do you approach the subject of becoming exclusive?

punchxcore
So I've been seeing a guy for almost 3 weeks now but I've known him for almost a month. We started talking for a week before going on or first date. So we've been on at least 3 or 4 dates now. Everyone seems to think he is my boyfriend because I see him quite often during the week and some nights I end up staying over at his house, but the subject of us becoming exclusive hasn't came up, but we've both made mention that we really like each other. The other night he asked me what I wanted for my birthday and I told him he didn't have to get me anything, and I also didn't know what I wanted. He also made mention of celebrating my birthday with me the day of, or day after my birthday.

But anyways, would it be too soon to be talking in terms of becoming exclusive, or should I just wait it out for a little while longer and see where it's headed? I mean, it's quite obvious that we both like each other, but I'm not sure if he's reached the point where he feels he wants to become exclusive, but I think it'd only make sense for us to become exclusive if I'm almost literally playing the role of his girlfriend.

Is it normal to be seeing a guy, and staying over at his house a lot, but still not reaching the stages of taking it a step further? I haven't done a lot of dating like this (with my ex we just went right into a relationship), so I'm not sure if it's normal to be seeing a guy, staying over at his house and still not claiming girlfriend/boyfriend status. It just hasn't came up in conversation, so I don't know if he's trying to see how I feel about him (even though I've told him I really liked him too) or he doesn't want to get involved like that too soon.

Should I take initiative and approach the subject and see how he feels about becoming exclusive, or would it be too early to even think about the subject? Since we've only known each other for almost a month.
Updates
+1 y
Can you ask where you stand with a guy without ever asking of becoming exclusive? Cause I don't know how to respond when my friend's ask me what my status with him is. They think he's my boyfriend and I just tell them that we're dating.
How do you approach the subject of becoming exclusive?
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