I would have to agree, you need to wait for the NRE to wear off some before you make life-altering decisions. That's just basic sensible behavior.
As for pushing someone to make a decision-there is no way I would have made a good decision in his shoes at 3 weeks. I ADORE my husband-but at the 3 week mark I wasn't even sleeping with him and sex is a big deal to me.
There are some things you just don't learn about a person without time passing and those things are often the ones that make relationships SUCK if they aren't in alignment....
So I suggest enjoying the moment and understanding that life is a journey-you don't need to rush to the finish line. The joy is in the GOING not the finishing.
"Love As Thou Wilt"