Dating people who have no friends

At one time, I thought it would be cool to date a girl that has no friends since she wouldn't ditch me to go hang out with them and she would be less likely to break up with me.

But, a friend of mine is dating a girl that has no friends. And I gotta say, it's not going well for him. It's not that they're fighting or anything, it's just that he sometimes makes a comment like he's tired of her being on top of him and he gets tired of her bugging him all the time. (When he comes over to my house, she's behind him 80-90% of the time.) When he tried to break up with her for other reasons, she sent him a text message and he got it when I was next to him. Out of the corner of my eye I noticed "....don't fit in with anybody anywhere. You're the only..." Later on that day, he said something along the lines of "I can't let her go. I'm all she has and I don't know what she'll do if she's alone."

Now, I'm not here to start an angst thread about my friend's relationship because that's his business. I'm just using it as an example to point out some of the negative aspects of dating friendless people.

When it comes to the positive aspects... maybe the person who has no friends would be less likely to break up and cheat on the other person since they would be more likely to appreciate the relationship & attention?

Discuss.

Jam it back in, in the dark.