why or why not?
and if so, how close is too close?

i am ok with it.

it'd be pretty silly to expect somebody not to have friends of the opposite sex.

i have guy friends, he has girl friends, it's just the way it goes.

i don't really know what too close could be defined as, my bf's not too close with his female friends. they text and email once in awhile, and have lunch and stuff, but they don't talk a lot or hang out by themselves really. i'm a lot closer with my guy friends than he is with his girl friends.

I have male friends, so how can I not be ok with him having female friends? I don't care b/c in the end, he only has one girlfriend and that's me.

I don't mind it at all. It's unrealistic to expect that of someone you're dating. I think them wanting to spend more time with their friends than you is pushing it though.. not matter what the sex of their friend. I'm always a little wary of ex-girlfriends though.. my ex called his exgirlfriend 'Babe" while he was on the phone with her and I was in the room.. that was definitely out of line in my opinion. So pet-names for their female friends = not ok.

Depends on the ex, really. If they were friends before they were dating, or have been friends for years, I don't think it's such a problem. The petnames thing = same kind of thing really. If it's really off, you'll know; if you're not sure whether it's something you should worry about or not, you probably shouldn't.