Definition: In this task, you are given a Reddit post as a text. Your task is to generate a title for this text. The title should start with "TIFU by", followed by a situation that caused humor. The title should contain 7-12 words, ideally.
Input: Text: before i begin i have to say that me and my girlfriend have been dating for nearly 5 months now and we've been doing it secretly, meaning her parents don't know at all. now because of this sometimes she tells me not to message back so her family doesn't read her stuff and find out. it was after one of these text that she responds and begins talking about staying locked up in the restroom forever. me being me asks why and she says it was because of her mom. i comfort her and she tells me a secret and after a while of being sappy with one another, she reveals that she's not my girlfirend and she's actually her sister. she then gave me a ultimarum that i either sext with her or she'll tell her parents everything about me and her sister(my gf) of course me being me i felt that sexting with her would be far worse than her parents parents finding out(i realized either way i was fucked so lord help me) so i opted to let her tell since i felt she was bluffing. i stopped replying and then my actual girlfriend came on(she proved it by sending two videos and 2 pictures of her which i didn't believe because by then my paranoia had kicked in badly so she felt i didn't trust her) i told her about her sister's conversation and she agreed it was dishusting until i mentioned thst she would tell her parents. she then told me that i should have sexted so here parents don't find out. i then (being a dumbass) asked her "what does that mean, would you have sex with someone else if it meant protecting me?" and she(thinking i meant sext) said yes. i then flipped becuse i thought she would stoop so low (even if it were to protect me somehow) and called her digusting. she then said she meant sexting and felt hurt and mad at me. by then i was just broken because i felt like an idiot and she said we were through. despite thst i still texted her and she said she "doesn't want to be with someone who hurt her intentially" and that sheneeded some time to think about it. she did tell me that were weren't through but she would sleep on it.

TIFU by not sexting with my girlfriend's sister