<human>: Can you succinctly summarize the text in 1-3 sentences?

Okay so girlfriend and I have been together for a while. Overall to me it was sad breaking up with her, but we had both checked out of the relationship a while ago. 

Our main problem was she wanted to get married yet acted nothing like what you'd expect out of a future mother. I was hoping over time she would mature but she never did so I never wanted to propose to her. She continues to waste a ton of money on online shopping/ gets pissed drunk way too often. After breaking up with her she keeps on yelling at me that I wasted 3 years of her life.

That's what she told me, however she started saying much worse things about me. She told people that I "essentially raped" her. In our relationship, I wanted anal sex. Now I didn't broach it off early, but like 4 months into the relationship, when we were both comfortable with each other, I asked her if she would be interested. She told me she tried it before and wasn't fond of it. 

To me, anal sex is a necessity. So I didn't break up with her, but I started distancing myself from her. She ended up coming onto me and then I told her that anal sex is a requirement if she wants to have a relationship with me. She ended up agreeing to it and we would have anal sex about once a month. None of the times did she cry, or anything like that. For some guys blow jobs are a requirement, for me it's anal sex I don't see anything wrong with that. I was clear with my demands and she had the opportunity to leave whenever.

There was some other shit we would do as well. But this was the big thing sexually that she went at me for. She kept telling me how I coerced her to do it and how that I pretty much raped her for all this time because if she didn't I'd break up with her even though she consented every time. She said that I now caused permanent damage, how she now feels like a slut because of me.

Can you guys tell me if I did anything wrong and what I can do in my future relationships to avoid this.
<bot>: girlfriend and I had arguments about anal sex, she eventually agree to do it. Now after we are broken up she hates me for it.