I found it scarily accurate and I'm finding all of the different interpretations so interesting.
I was brought up to always consider others feelings, give people a chance, don't upset anyone etc etc. And I can definitely recognise her thought processes and the way she a) slept with him and b) agonised over breaking up with him because she didn't want to hurt his feelings. I've certainly done both of those things when I should've been old enough to know better.
My interpretation of it was that she almost felt obliged to like him once he started flirting with her and because of her fear of hurting his feelings, unconsciously put her own feelings and instincts on the back burner to try and make him happy and as a result ended up in a horrible situation.
To me the 'villain' in the story wasn't the guy - although he wasn't great- it's the way many women are socialised into being nice, kind and always appreciative of male attention. I don't think I'll ever fully shake it off but I'm trying so instill a certain amount of 'put yourself first' with dd.