Hiyas! I've learned through time and experience (and various best friends) a few things that I happen to believe that a true best friend should never do. If you disagree, it's OK. That's either because you do some of these things, or you just don't agree. Either way, here's what I think :

1.) Your best friend should not mimic your every move. They shouldn't like every single thing that you like. When I say this, I mean, that they shouldn't "start" liking it just because you like it. There's a difference in them taking interest in it all of a sudden, and them doing it because you do it all of a sudden (and then pretending that they've been doing it all along).

2.) Your best friend should not try to be friends with all of your friends. Should they be friendly with your friends? Yes. Should they be friends with ALL of your friends? No. It's OK to have a few mutual friends so that you all can hang out together or something. But if they are friends with ALL of your friends, who are you going to go to when you need to complain about them? :

3.) Your best friend shouldn't tell you when someone (their friend) says something bad about you in hopes that you will become upset. That's just wrong.

4.) You best friend should never talk bad about your flaws as a way to make their flaws not seem so bad. If this happens, hopefully you are secure enough in yourself AND your flaws that it won't bring you down. Therefore, it won't go according to their plan (their evil little plan).

5.) Your best friend should never compete with you or compare themselves to you. This is a big No-No. It's not healthy for them, and it's not fun for you. :-/

6.) Your best friend shouldn't laugh when you talk about your old friends. Just because you aren't friends with them now doesn't mean you want them talking about them. Example: If you used to be friends with two girls who everyone considered geeks, but you went your separate ways after two years (and didn't end on bad terms), you don't want your current best friend to talk bad about them or laugh at the fact that they were/are geeks. Because you were one of those geeks and you loved those geeks a lot (and still do). :-[

7.) Your best friend should never say these words: "Why would you say that? You're supposed to be my best friend!" The fact of the matter is, you aren't supposed to be their best friend. You simply choose to be their best friend.

8.) Your best friend should never say these words: "I'm sorry for whatever I did/said that made you mad." They should, however, apologize for exactly what they did/said. They should know what they did. When they say this, it seems as though they're trying to bury the hatchet without owning up to what it was that they did (therefore, still trying to say that they don't think they did anything wrong). :

9.) Your best friend should never be extremely defensive when you're trying to hold a decent disagreement (LOL!... but seriously). When they're extremely defensive, they won't pay attention to anything that you say that could possibly be helpful to them. They just want to make you see their point, without them being open to yours. It really stinks... :-/

10.) Your best friend should never be too ashamed to say, "I love you". If they really don't love you, then it's OK. But, if they do, and you tell them... they should say it back. For all you know, it could be the last chance that you have to tell them. Everyone that you love should know it without a doubt in their minds. :'(

11.) Your best friend should not be afraid to confront you about something that you did that they didn't appreciate or approve of. And you should want them to tell you. :-*

12.) Your best friend should not agree with you on everything, or let you make all of the decisions. And you shouldn't try to be the one making all of the decisions. They have a voice as well, and it deserves to be heard (whether what they think sounds dumb or not).

13.) Your best friend should not try to make you look bad/embarrass in front of your crowd. Self-explanatory... ???

14.) Your best friend should be able to admit when you are right. If they are usually the ones who are right, they should understand that they won't always be right. If you are usually the one who's right and they get sick of it being that way, OH WELL! If you're right, you're right! It is what it is. :

15.) Your best friend should never flat-out say that they things that you take interest in are "dumb" or "stupid". Rather they should say, "I don't like that," or "I think that's dumb/stupid".

16.) Your best friend should never (and I mean NEVER) join in on your hate! If you are telling them something about something that your brother/friend/cousin (or anything else) did that seriously ticked you off, it's OK for them to say, "I'd be mad too." But when you start talking about how you can't stand them and all this other stuff, they shouldn't then say, "Yeah! Soandso is stupid! I don't see how you put up with him. He's such an immature idiot!" (or something to that effect). They should listen to you. Most of the time, you just want to vent. They can't judge and listen (primarily because they're on the outside looking in. they aren't in a position to judge the situation). >:(

If you do this stuff, STOP! If it's your bff, talk to them (calmly).