I am so sorry to read this because I know EXACTLY how you feel, my first husband left me 3 years ago when we were ttc. It was totally out of the blue.
I was completely crushed and felt like my life was over. All I can say is it will get better and you will get over it and be happier than ever in the future. I met my current OH 2 years ago and we have so much in common I'm now really happy the way things turned out.
I hope this helps and we are all here for you!
Take care hun

SW xxxx