Does it ruin a guy's ego if his partner is more attractive?

Haha. I love this question. I am one confident s. O. B. I am about a 6. 8 (generously). I have never dated a girl that was less attractive or even as attractive as I am. And you know what? it's f***ing fantastic.
if someone dates up, good for him/her. On the other hand, get a band on her finger because one day she will find all those mirrors you hid.

It varies. Some guys play way over their head and don't get why it doesn't work and others don't try because they think they are outclassed.

I know of no guy who is wounded by being seen with a hot woman though I know of a lot who will never get up the balls to ask the woman who is practically throwing herself at them.

My ex was very jealous, but not of other guys - of me! he was in some kind of weird competition with me and he hated it that more men looked at me than women looked at him. So yeah, if he's a narcissist, it could be a problem, lol!

but better to stay away from that type anyway, ha ha!

This seems more like a way a girl might think than a guy. A guy wouldn't ask because he thinks there's a better chance she'll say no.