Why do narcissists marry so quickly during the luring phase?

The replacement (NW) found me about 3 months after she left him. I think she had difficulty finding me because I had moved so much in the last few years. Move with N, move away from N. She found somebody who gave her my e-mail. Oh, he said the same lines of endearments. Wrote the same phrases in his love letters. The abuse was identical. But also tailored specifically. I was not impressed with threats of suicide. She was really upset by such threats. He used slightly different manipulation tactics based upon our unique weaknesses. I think I knew within 6 months of the marriage that he had married me to buy a house. but I went into denial. The D&D started almost immediately after the puchase of the house & moving in. It was a real Dr. J & Mr. H situation. The cycle of abuse was about 7-10 days. And when he was Mr. H -- the things he said were HORRIBLE. And then, poof, as if nothing happened. I was to "forget" -- And he never apologized because he had not intended to hurt me -- If I was hurt that was my problem because I saw things that way. And if I felt any hesitation or reserve, I was attacked for holding grudges. Attacked for being a petty & small person for nursing grudges over trifles. But all his RAGE was over trifles. Seriously, if a person loves another -- they do not spend 33% or more of a relationship doing the silent treatment. They do not spend every holiday making a theater & a drama to ruin everything. They do not make clear that work is first, the gym second, the house renovation 3rd, and then maybe -- just maybe -- the wife 4th. It's not rocket science. I lasted as long as I did because I used tranquilzers for awhile. And, of course, I was married. And I had no where else to go. I was financially strapped for ready cash because I gave everything to him. My check was spent before it was even issued by my employer. I plotted my escape for about 6 months. I stopped giving money to the house. I went to therapy alone. And I found a girlfriend who allowed me to rent a room in her house. I think the final catalyst for me was when I read Robin Stern's book, THE GASLIGHT EFFECT. I read what my N was doing. He is a poster child for what she calls the Intimidator Gaslighter. She said these are the most dangerous & they often go to physical violence. he was beginning with he physical when I left. (Spitting, shoving, threatening violence.) When I read this book, I finally recognized that I was NOT the crazy one. That I was afraid all the time because he was indeed a dangerous man. If a woman writing a book could write out the exact words 7 tacktics my N was doing -- Hell, I better scram. This had zero to do with me (as my N said). He was a twisted creature & it was time to go. I contacted the first ex-wife., She lasted 20 years. She told me that he was physically violent. And that I was correct. I sensed that he was trying to push me into what I believed to be depraved sexual acts. Truing me into an object. She said he was totally into S/M. He kept all that a secret from me. Was gradually training me & tearing me down. Trying to make me completely submissive. The man is a MONSTER. And a well-respected university professor. It's too creepy.