I'm sure she loves you anyways because you guys are best friends
Nothing. You respect yourself, your relationship, & your boyfriend.
Staying with another friend's relationship after your breakup means that you still have feelings for the other person.
This largely depends on the relationship you have already established with the girl and the question she asked. It could be a variety of answers, including she likes you and wants to be in a relationship with you, or you are a trusted friend and she needs relationship advice.
Not if they are in a relationship already. You could end up risking your friendship over it. If you really value it then you probably shouldn't say anything.
The best way to stay friends after a failed relationship is to forgive one another like any friend would.
No. Not unless they are already finished. If you are a good friend, you will not mess with his relationship, and if you do mess with it and she dumps him for you, she will probably dump you for someone else, too.
You don't. If you feel as though you absolutely need to act on your feelings, be prepared to lose both your boyfriend & your best friend if the new relationship doesn't work out. You should respect the fact that you're in a relationship.
Hugs as a greeting is fine, but cuddling up together is not right when he is in a relationship. When in doubt put yourself in the shoes of his girlfriend.
A relationship is just that, like a friend and friend, or children with parents.
Yes, it is possible that you may start another relationship with them.
The reason why one ex-friend is nice to while another is not may be because the one being nice to you wants to mend the relationship.
It will ruin our friend like relationship