Definition: Given a real-life anecdote of a complex ethical situation, generate a suitable title that describes the main event/root cause of the situation. Imagine that the given text is a social media post, and you have to write the title of the post, so the users can decide to read the main text or not.
Input: My now ex girlfriend lives with her sister, and I would often spend time with both of them and sometimes just her sister. For the first two years, I was madly in love with my ex and the sister was always supportive. We all got along besides small fights between my ex and I or my ex and her sister. 

However, after year two of dating, I started to notice some problems that my girlfriend and I had. Things like her not being as kind to me as I would have liked or her being very extroverted and me being very introverted. We would frequently have fights revolving around these issues.  Despite these issues, we were still working hard to rise above them and live happily (nothing worth breaking up over).

Now brings me to the meat of the problem. My ex girlfriend's sister was introverted like me and was much kinder to me and all people in general. Granted she had her own problems, but they were issues that never really bothered me. Because of this I saw myself falling for her sister. I still loved my ex at the time, but I couldn't stop my feelings over her sister. I also think it's important to note that I never acted on these feelings besides maybe some mild flirting that I quickly ended when I realized what I was doing.

I tried for multiple months to suppress these feelings and find ways to make me not be in love with her sister. I tried everything I could, but I finally decided I had to end things with my long term girlfriend. She was shocked and angry to say the least. I explained that it was because of the other problems mentioned before (partially true), but I never mentioned her sister. She was very angry with me saying it was abrupt and things were improving. I said how sorry it was, but it just couldn't do it anymore.

I have since cut off all contact with both her and her sister, and I have no plans to try to make a relationship with her sister. So reddit, AITA?

not telling my Girlfriend the real Reason I broke up with her