How do I get over my ex, he left me when we were engaged and planning babies just before my 30th birthday?

a year ago. The last few years of our relationship I was really sick and i GIT MOODY BECAUSE OF my illness. I really want to know that i will fall in love again and have kids but there is no guarantee is there. I just want to be truly happy again. I have a good life and I make the most of it but all the time i have this hanging over me. I'm afraid when I meet a guy he will be scared away by me.I'm getting older and its scary