I think I hate my friend

So I'm a person who has a hard time making friends and I have only 2 and one of them makes me feel bad all the time and is just overall really manipulative and can’t feel happy for me anytime I do something good like I went to Erasmus and I just stopped talking to her about the experience cause she’s so negative about it and to this day if I bring it up she says she doesn’t want to hear me but then she goes on to say how I’m her best friend and that she really cares about me the thing is I don’t know how to break this friendship cause what if I regret it but everyday I’m just so miserable while talking to her so I need to do it does anyone have advice on how I should approach the situation