Oh Logan, I know exactly how you feel. I am a month in now and have lost a stone and a half! (not complaining about that bit)
I want to ring him all the time, I want to text him, I want to check his Facebook every ten bloody seconds. I can barely resist it. But what good is it doing me? Nothing. You can't make him come back. He has run away, you have to let him go.
I promise you, however hard it is, if you cut as much contact with him as possible, it will make this easier for you. Dn't worry about what he is thinking. Every time I look at his Facebook page, I feel sick and start shaking. Why would I do that to myself? I've stopped but it's so so hard. The drama will make you ill, you need to take yourself right out of it.
The thing is, if you were meant to be together, if he loved you, he would come back, whether you chase after him or not. You didn't force him to marry you, but you can't force him to stay.
I know it's hard to hear. Just think about today, not about your past, not about the future. Just today. xxxxxx