Or maybe they're ugly as hell, or do not even comply to basic social rules like "could you at least take a shower once in a while darnit".
Also, some people have been single for a long time because they were scarred by some heart-breaking experience. So... They would like to love someone, but feel like they are unable to. These are the hard-to-get, and, very often, the reward is really worth the effort!
Kinda rude, but... honestly true. I do know a guy who apparently takes a shower maybe once a month. He's... a huge dickhead, who talks shit about stuff he doesn't understand. Honestly, I could start another text series on the shit he's said.
Why must it be a need to have someone? I'd rather have someone because I want them and I want to make them happy instead of needing them. There is nothing superior of needing than wanting. If anything, if someone doesn't need you but work so hard just because they want you, isn't that more honourable? They can live without you but they CHOOSE to have you with them because you make things better in their life. Its sometimes miserable to need someone; speaking from experience. Wanting someone is a much better pleasure in life.
Now you want 'em to start from scratch teaching YOU???
Also, some people have been single for a long time because they were scarred by some heart-breaking experience. So... They would like to love someone, but feel like they are unable to. These are the hard-to-get, and, very often, the reward is really worth the effort!