I myself Went through that not too long ago..
He was a muslim and I was a christian who converted out of islam... I could of given up my God for love. But I choose to believe that God has his own plans for me. And now thats its over I have my closure. I prayed about this for so long... and in the End Gods will was done. After a month I find out he was still with his four year old girlfriend while I was with him for a year. ...
You CANT change the PAST, & you CAN'T let it stop you from going FORWARD! NO MATTER how bad it HURTS life GOES on..What's meant to be will ALWAYS find a WAY!
the only thng I can say is pray pray and pray... Don't try to plan out your life without making sure God is in the middle of it!!!
In the end you will have to answer Him..
Good luck!!