It's hard to find any advice on a break-up with a nice ex-boyfriend, can anyone relate?

My ex girlfriend was the best girlfriend a guy could want. I knew what I had. I treated her like a queen and never cheated or disrespected her. Our relationship lasted for nearly 2 years without any true fights or arguements when she just suddenly broke up with me saying she wasn't ready for a serious relationship. We did everything together, she never complained then all of a sudden she just up'd and left. She tore my heart to bits and at first I couldn't find a reason to complain about her or hate her but then I realized the pain she put me through when she broke up with me and that was enough to hate her and get over her. It's been 4 months that we last spoke or saw each other and though I'm truely not completely over her, I do find myself thinking less and less of her. She ruined a perfect thing and in time, she'll come to realize it.