Totally don't understand

Well to cut a long story short(er) I came out of a 2 year relationship about 6 months ago.. not on good terms so we don't talk, but even though a lot he did was so awful, I still think of him and find it hard that we don't talk at all or see each other, even though we work in the same shopping center. Loads has changed with me and I don't want to be back with him.. I dont know why I keep thinking about it :/ Any tips?

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