Many people would think that WCY was silly when he kept avoiding Lin Chao Ying and refusing to marry her, causing all sorts of troubles for both... but was he really silly ?
The two travelled jianghu together, fighting the Jin invaders. Then as we know, WCY's army was defeated and he retreated to the Ancient Tomb, until LCY forced him to come out. It was said that they probably had feelings for each other, but WCY kept giving her excuses, such as: "one should not think of marriage until the invaders have been defeated" and other similar bullshit stuff. Why would he say that to a "perfect" woman: highly intelligent and talented, very beautiful and very supportive of him...
I reckon WCY thought that while LCY was a good friend, she would be a terrible wife/lifelong partner due her being very possessive and controlling. We can simply consider the bet she forced WCY to make when she tried to get him out of the Tomb:
"If you win, I will commit suicide. If I win, you will either have to listen to what I say for the rest of your life, or you will have to become a Taoist, give the Ancient Tomb to me, and build your sect's shrine on this mountain."
So he couldn't win, because he didn't want to lose a good friend. He didn't want to pick the first option if he lost either, because that'd mean he would have to wear a skirt and a bra for the rest of his life. What self-respecting man would do that ? The other option wasn't great either... but to him it was better than the other two. It seemed clear to me that while he might have some feelings for LCY, he clearly didn't love her. He was scared of her, more accurately.
LCY, what a bit*ch she was. See how extreme she (and her sect) became after that. Spitting on his portrait became the first thing an Ancient Tomb disciple had to do. AT disciples had to be females, and would have to hate all males because they are supposed to be arseholes that cheat on women and treat them badly (although WCY never did). It would be fine for AT disciples to beat up others, but if others defend themselves and happen to injure or kill an AT disciple, it would be murder. Granny Sun was trying to kill that Quanzhen master, too bad she was too weak and got killed, tought titties. Yet we can see how Yang Guo and XLN turned it around and made it seem like the entire Quanzhen sect were oppressing an old lady and a small child, and killed the poor lady...
I'd rather become a stinking cow-nosed Taoist than marry such a woman. Apparently WCY thought the same ^_^