What Should I do now…. Need help

I did NC for 45 days.. I sent a elephant in the room email and no response. I waited 7 days and did a happy short email but still no response. I don’t know what to do. Should I send another email. This is a long distance relationship we had for almost 3 yrs. We saw each other often (twice a month) but circumstances cause me to start feeling some type of way and I expressed that and her response was always short and came across as if she didn’t care and that would bother me so i would want to talk more and she got frustrated but we would move past it and be ok, so I thought but she was actually holding on to all those times and then one min we good then the next she can’t do this.. So how are we good one min and then the next argument pushes her over and break up. if we are at 50% as far as deciding if you don’t want the relationship anymore why not tell me but when it hits 95% and totally shock me then where was the previous communication that we were close to being done. So what should I do now.. She has also blocked me on text, and social media.. even though we never communicated much through social media.. She just stop following me on Instagram.

Please tell me what should i do now.. She’s very stubborn and said before she don’t usually go back to ex’s but a week prior talking about us getting married and me moving to her city and spending our life together.. Its hurts and just confusing too.. Like why and how if I mean that much to you but you just go ghost on me

Need help – should I email again ??