How many dates in three weeks is normal/too much?

Guy likes to constantly see me because he likes my company. I try not to be so available so we do 1 or 2 for the week. Last week we only saw each other 1 time. Is 2 dates too much for the week especially only dating for 3 weeks? He talks about the future a lot and includes me in it. He likes how I'm different from the other girls and our conversation flows so easily. I feel like its moving a little too fast being he is talking about me coming over his home and him giving me a spare key. I feel like that is a little too soon. His also stated what if he asked me to be his girlfriend what would you say? Do you feel that it's too soon for this?
How many dates in three weeks is normal/too much?
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