Why do friends do this?

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Do any of you have friends that don`t liketo see you doing anything?Imean i have a friend who i`ve knownfor years and when i said i wasstarting my driving lessons she saysshe had thought about doing itto and that she wouldn`t need manyanyway as she`s taken them before,i said i was doing an openuni course and she wanted to do one to,i told her i passed my theory test and she says when she was drunk that she passed her ages ago but never told anyone,it`s the first i`ve heard of it!!Why are people like this? LOL,if i say i bought a pair of shoes at £50 she tells me her new ones cost £60,why???