My friend proposed to a girl after a month. He bought the ring when he & I took a trip to Portland about 5 years ago. He proposed, she said yes, they got married in 2 months. Been together ever since. They are one of the only couples who I think are perfect for each other. Usually, I feel that people that are too much alike are the ones that are doomed. They pretty much blew that theory to crap.
However, I, on the other hand, dated my (now) wife for 5 years before we got married. But, since we had been together so long, marriage wasn't even a big deal for either of us.