Are people suppose to be friends or yes people?

What is a friend? Why do we have them? I've always thought friends are people who are suppose to be honest and be there for you when you need them, but sometimes I wonder if that's true. Lately it seems as though one of my friends doesn't want a friend she just wants someone who will sit there and lie because she doesn't want to hear the truth. Now granted nobody likes to hear the truth, hell I don't like to hear the truth but I would rather hear the truth and try to change then sit there and pretend everything is ok when it's clearly not. My friend who's name will be changed to Stacy does not get the hint that she isn't well. She is emotionally unstable and keeps letting herself get hurt by her "ex" or truthfully I don't know what he is. This boy and I use the word boy because he is not a man. This boy keeps treating her like crap and they keep "breaking up" but then she is, I'm sorry to say, dumb enough to take him back. Now I'm not saying it's entirely his fault she is just if not more to blame than he is. Now typically when a girl breaks up with a guy or the other way around the dumper will try to avoid the dumped. In this case Stacy keeps trying to have a relationship with this man and here is why he doesn't want her he has an arranged marriage. And Stacy can not get through her head that their relationship will never work because they not only religion differences they also have culture differences, she's white and Christian, he's Hindu and here's my favorite part she is closed minded and believes that things should be her way, and is not very open to changes. She is emotionally wrecked and she also has trust issues, she doesn't trust anyone but herself, when she told me this I told her straight out that she cannot be a counselor if she doesn't have an open-mind. Now I decided to give Stacy a little test last Friday when we hung out, I told her that in order for her to get the ball back in his court, especially because again they were "broken up" I told her to not talk to him for the entire weekend, well of course I knew she wasn't going to follow through and then she tries to justify why she was texting him and then ruined our night. We ended up leaving around 9:00 because she started to get sad, now out of respect for her boss, I just said fine we'll leave because I didn't want to confront her in front of her boss. I kept quiet in the car and just like I knew she would because she always does she brought him up and I told her the same thing that I have been telling her for about 2 months that this guy is not going to take her seriously, he is not going to commit to her, blah, blah,blah,blah and here's my other favorite part I am not the only person who has been telling her this. Oh no her boss and a few of her other friends have been telling her this as well, and because of this she is not speaking to some of her friends. And tonight it seemed as though she was trying to end our friendship because and I quote "I am not emotionally stable enough to be able to stand here and have you call me narcissistic and I like that your blunt but at times I just don't want to hear it." So I told her something that I have been wanting to tell her for weeks, I told her "I don't bring up your "ex" you always bring him and you bring him up because you not only want to rant but you're asking for advice but unfortunately I'm not telling you what you want to hear. You want me to tell you "fine go ahead be with him" well unfortunately I'm not going to sit here and lie to you like you want me to, especially because I can see that he is hurting you, and that you are not well." What is the point in having friends if they're not going to be honest with you? Why have them then? Why not just say I don't want a friend I want a lackey? So my question is are friends suppose to be honest with you or are they just suppose to tell you what you want to hear instead of the truth?