Wasn't I good enough? Why didn't he try harder?

Candiiiiiired
He told me I was the one. We looked at engagement rings together, talked about a future, where we would live. I introduced him to my family and friends (first serious relationship) and he did the same (for the first time ever). We even went to a wedding together everyone was so happy to meet me, told me I was beautiful and he was a lucky guy. We lived 2hrs apart so it was a struggle sometimes seeing each other but we did the best we could. He told me he loved me and couldn't wait to take our anniversary trip then two days later we had our first major argument and BAM he broke up with me!!

Since then everything has went downhill! He refused to meet me face to face, ignored me, wouldn't return my calls. I just couldn't understand why he didn't fight for us. Was I not good enough in his eyes? Was the long distance really that hard? What about the love and respect we had for one another? Did I not deserve a fair fight after all that? It's even worse my sister is in an amazing relationship with a guy that goes above and beyond for her. I feel so guilty I am actually jealous of her and instead of celebrating with her I feel pain every time I look at them. I'm so upset that this has happened. Not only am I loosing my sister to her potential husband I feel I have also lost my best friend (him) and I am lost!!! I admit I crossed the line and went crazy during post breakup something's I regret but I am still so lost! I want to move on but I don't even know where I went wrong. I can think of a few things but how do I know for sure if he won't talk to me. WHY DID HE GIVE UP ON ME/US?
Wasn't I good enough? Why didn't he try harder?
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