Most Helpful Girl
First off stop messaging her right now - I'm pretty sure you're probably trying to think of the perfect thing to rationalize to her that you two can be together, it sucks but there is nothing you can do. I know this is the last thing you want to hear and after reading this you will probably disregard my advice (I went through this a few months ago and I begged and pleaded and in the end he didn't even want to be friends with me and is now telling people I am a horrible bitch) but you really need to give her space or you will lose all of her. Wait until she replies and then when she does tell her you need some time for things to stop hurting so bad - that you aren't thinking clearly, let her know that if she needs you you are still there for her but otherwise don't message her/call her and try not to think about her. You have to start moving on now because things more than likely won't work out and it will only hurt more in the long run to keep holding on. And on the off chance that she does come back to you, you don't want to seem desperate or like you were waiting around for her - that will only give her power over you and nobody should have power over the other in a relationship. I do really hope things will work out but all you can do is wait it out and when things stop hurting so bad (maybe in a month or so of not talking to her) you can message her and make her realize she misses you.
Someone actually told me something that helped me realize I had to cut my ex off it was this - You are only enabling her to move on - Because you will still be there, fulfilling her emotional needs which makes it feel like she hasn't lost anything and makes it so easy for her to move on. Then when she has moved on it makes it so much easier to fall for that person because they don't have to do anything because you are still there so they just have to be attractive to her until they are able to do it all themselves and then you will lose her anyway.
Most Helpful Guy
I'm Going To Give You My Unlicensed Professional Opinion, You Can't Force The Relationship Back So It's Best To Just Back Off & See How Things Play Out In The Future, Leave Her Alone, Your High In Your Emotions & Need Time To Let Them Die Down, She didn't Forget All The Good Times You Guys Had Together So Tryna Throw It Back Up In Her Face Is Pointless, Just Relax, Seriously, You'll Feel Better Over Time iPromise, Stay Strong & Stay Positive...