It means you helped her out in some way(s) and she did something bad to you. Example: A friend of yours has lost their apartment and he needs a place to stay. You let him live at your house and you pay for his food for three months until he can get an apartment.
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AnonymousThank you for your wonderful explanation! By the way, would you please make a grammatical analysis? Why use "not after"? Is something omitted?The missing piece can be explained as shown below. The 'not' is borrowed from the preceding clause.
wangqh2696122the link belowI took a look at that link, and it occurs to me that 'despite' (actually, 'despite the fact that') is more like the definition of 'not after', not the definition of 'after', in their example sentence.