Sometimes when you don't want something to happen, you gotta say no, cause silence is often treated as an agreement.
So for example, if you don't like to be friends with a particular person, you've gotta stray away from her, even if she clings on to you like a magnet. The truth is, if you don't, she's never gonna know what you think of both of your relationship and you're just going to put yourself through the same torture again and again.
And it's not only a torture for yourself, it's a torture for the people around you as well. If you don't settle your own shit, you choose to hide, then that's fine with me and everyone else. So you don't come complaining to almost everyone that you don't want to be friends with this particular person again and again, everytime after she leaves.
And if you are on the other side of the boat, you gotta act, be and think smart. I just learnt in Bio today that it's all about inheritance and I remember seeing this part of a chromosome that says SMART and NOT SO SMART. So whether or not you inherited the dominant one or the recessive one, sometimes, I think everyone has common sense. Even someone with an IQ as low as mine.
To avoid bad relationships in life, if you're in the first situation, you gotta be truthful. If you don't and you go on ranting, it's gonna mess with every other relationship in your life. If you're in the second situation, never test one's limits.
End.