Why is it still awkward around my friend/ex crush? Is it just me? Please help?

I used to have this massive obsession with a girl that went for nearly 3 years... I dont have any feelings for her what so ever anymore and shes part

I used to have this massive obsession with a girl that went for nearly 3 years... I don't have any feelings for her what so ever anymore and she's part of the friendship group that I'm (i've changed once before but she came to that one as well) So I can't really get away from her (not that I really want to or need to anymore) Although we have to tried to become friends lots of times. It hasn't really worked that well.. ages ago we used to have fights all the time.. Now days we deal with each other pretty well most of the time but some days.. I feel that there is some sort of tension that won't go away.. in some situations like sitting next to her (which I can kinda tell that she does not want me to) etc. I mean it is some sort of bad vibe that has been here since the start and it doesn't make it any better one of her closest friends is mine. I get the feeling that she doesn't want me aroun but some days she'll talk to me like i'm her friend? I just don't really know what to do anymore and I don't wanna approach her about it because I already have done this half a billion times before and think it will make me look like an idiot.. This whole thing upsets me because I thought she would be mature enough to accept that past is past and I'm not who I used to be anymore and I don't have any feelings for her what so ever.. (which I undoubtedly thought she did) This is my last year in high school and I don't want to finish it with this rubbish in mind. (Is it me that makes it awkward or is it her or is it both of us?

or:I used to have this massive obsession with a girl that went for nearly 3 years... I don't have any feelings for her what so ever anymore and she's part of the friendship group that I'm (i've changed once before but she came to that one as well) So I can't really get away from her (not that I really want to or need to anymore) Although we have to tried to become friends lots of times. It hasn't really worked that well.. ages ago we used to have fights all the time.. Now days we deal with each other pretty well most of the time but some days.. I feel that there is some sort of tension that won't go away.. in some situations like sitting next to her (which I can kinda tell that she does not want me to) etc. I mean it is some sort of bad vibe that has been here since the start and it doesn't make it any better one of her closest friends is mine. I get the feeling that she doesn't want me aroun but some days she'll talk to me like i'm her friend? I just don't really know what to do anymore and I don't wanna approach her about it because I already have done this half a billion times before and think it will make me look like an idiot.. This whole thing upsets me because I thought she would be mature enough to accept that past is past and I'm not who I used to be anymore and I don't have any feelings for her what so ever.. (which I undoubtedly thought she did) This is my last year in high school and I don't want to finish it with this rubbish in mind. (Is it me that makes it awkward or is it her or is it both of us?

or:well she is the one it looks like that keeps showing up where your at or something your involved in she just keeps showing up she doesn't seem like the type to just back off if its imature it says alot about her it doesn't seem she wants to be up front about anything but doesn't want to be what you would conscider imature do at this point what you feel is right for your self and stay to that

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