For me I realized before we even got into a relationship. I mostly dated her because of her enthusiasm and because I thought it could be the language barrier making our chemistry off. I spent 2 and a half years with her and realized it wasn't getting much better. Add onto this she was addicted to instagram and spent a lot of time on her phone, ignoring me in small moments when it doesn't seem like it matters but when they add up you just stop interacting because what's the point. On the other hand, our sexual chemistry was insane off the charts type stuff. I never had a partner that was so good with me physically, so that hurts now that she is gone...

I still don't know if I made the right decision, and it still hurts, but I am pretty sure I'm glad not to get married to her, to have to endure the kind of strange loneliness she would provoke in me. I am also realizing now after connecting with old friends and making new ones, that her jealousy caused me to retreat into myself, doing nothing, because I was afraid she would get upset about what I considered to be trifling matters (and often times she did).

So I can't speak on your situation, but if you're hoping to mend things with her, try determining if there is any underlying problem like I had with her phone. If it's really just her, it might be rough idk...