No, it's not necesarily wierd.
It's fine to be into the cuckhold stuff he was describing to an extent.
It doesn't necesarily mean you like that though.
Comparing to others is part of pair bonding.
You look at other people, people with good qualities, who are atractive, etc. but you like eachother better, and you affirm your relationship.
You might just also like the idea of her being sexual and unrepressed - and taking that out on you back home.
Or, if she likes looking at other guys - it's cool for you to look at other girls.
What do you think?