What's really the difference between a best best friend and a boyfriend?

alyssaishere
Yes besides the sex and kisses etc, what's the primary difference between a very good best friend and a boyfriend?

Love columns say that a boyfriend is one who "is always there for you when you need him", "will always support you", "will make sacrifices even when it's hard"... etc

I think that this describes a really good best friend as well. So what really (aside from the sex) makes your boyfriend one and not your best friend whom you have sex with?

Thats not my question though. My question is, if there is no other difference between the both, why do partners expect so much from one another, yet expect much less from their best friends?

For example, some girls get upset when their boyfriends have things to do and other friends to hang out with instead of spending all their time with them. And when the guy isn't always "caring" or treats the girl like a princess it's cause for anger?

There's no such expectation from a best friend though. Why is that?
What's really the difference between a best best friend and a boyfriend?
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